Updated readme.md

README.md

 # Zoom emergency exit button
 
-Just press the big red button to quit zoom metting
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+Just press the big red button to quit zoom metting !
+
+![cover_image](./img/cover.jpg)
+
+## Hardware required
+
+* 1 Push button
+* 1 Arduino Micro board (or Leonardo)
+* 2 Wires
+
+## Schematic (so simple)
+
+![schematic](./img/schematic.png)
+
+## Upload the code
+
+This project has been developed under VSCode/PlatformIO.
+Simply use "Import Arduino Project" to build and upload the code to the board. 
+
+Select the board you are using (Arduino Micro or Leonardo) and find the zoom-emergency-exit-button folder you have downloaded and unziped
+
+![Pio_image](./img/pio_screenshot.png)
+
+Plug the Arduino to your computer, Compile & Upload !
+
+![Pio_upload](./img/how_to_upload.png)
+## Troubleshooting
+
+If the compiler can't find the `Keybord.h` file, check the external librairies path under `platformio.ini` file.
+
+**Note 1** You might need to install the Arduino IDE to have access to this lib...
+
+**Note 2** If you want to change the code and pressed letters, be careful, the library uses the QWERTY template.
+
+**Inspired by this project** : https://www.instructables.com/Easy-Zoom-Quit-Button/ 
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include/README

+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:micro]
+platform = atmelavr
+board = micro
+framework = arduino
+lib_extra_dirs = /snap/arduino/50/libraries

src/zoom.cpp

+/*
+  For the Arduino Leonardo and Micro.
+
+  Sends a key sequence when a button is pressed.
+
+  The circuit:
+  - pushbutton attached to pin 2 and GND
+  
+  created 24 Oct 2011
+  modified 27 Mar 2012
+  by Tom Igoe
+  modified 11 Nov 2013
+  by Scott Fitzgerald
+  modified 07 Mar 2021
+  by Mickaël Theot
+
+  This example code is in the public domain.
+
+  http://www.arduino.cc/en/Tutorial/KeyboardMessage
+*/
+
+#include "Keyboard.h"
+
+const int buttonPin = 2;          // input pin for pushbutton
+int previousButtonState = LOW;   // for checking the state of a pushButton
+
+void setup() {
+  // make the pushButton pin an input:
+  pinMode(buttonPin, INPUT_PULLUP);
+  // initialize control over the keyboard:
+  Keyboard.begin();
+}
+
+void loop() {
+  // read the pushbutton:
+  int buttonState = digitalRead(buttonPin);
+  // if the button state has changed,
+  if ((buttonState != previousButtonState) && (buttonState == LOW)) {
+    Keyboard.press(KEY_LEFT_ALT);
+    Keyboard.write(97);//"q letter"
+    Keyboard.release(KEY_LEFT_ALT);
+    delay(100);
+    Keyboard.press(KEY_TAB);
+    Keyboard.release(KEY_TAB);
+    delay(100);
+    Keyboard.press(KEY_RETURN);
+    Keyboard.release(KEY_RETURN);
+    delay(500);
+  }
+  // save the current button state for comparison next time:
+  previousButtonState = buttonState;
+}

test/README

+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html