Add a license and a readme files

LICENSE

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+MIT License
+
+Copyright (c) 2017-2020 Michaël "e7d" Ferrand
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# gamepad-viewer
+Displays live status about gamepads connected to your computer
+
+## Demo
+[gamepad.e7d.io](http://gamepad.e7d.io)
+
+## Shortcuts
+- `+`: Zoom gamepad in  
+- `-`: Zoom gamepad out  
+- `0`: Reset gamepad zoom  
+- `B`: Change background color  
+- `C`: Change active gamepad color  
+- `D`: Toggle debug mode for active gamepad  
+- `H`: Display help  
+- `Delete` or `Esc`: Clear active gamepad
+
+## Supported Gamepads
+
+- Sony DualShock 4*
+- Microsoft Xbox One Controller*
+- Microsoft Xbox 360 Controller
+- Nintendo Switch Pro Controller*
+- Xinput compatible gamepads
+
+*: These gamepads work both wired and wireless via Bluetooth