Add a basic README file

README.md

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+# View Page Source (Mobile)
+This small web extension adds a `View Page Source` menu item to Firefox for Android as well as an icon on desktop browsers.  
+While the usage on desktop browsers might be questionable, it is really handy on mobile devices.
+
+## Supported browsers
+- [Mozilla Firefox]() (Desktop & Firefox for Android)
+- [Google Chrome]() (Desktop)
+
+## Usage
+Simply click the icon or menu item to view the page source.
+
+## Why to use this web extension
+The code is completely **open source**, you can also use the unpacked version of this web extension if you prefer.  
+No data of you will ever be logged and the web extension asks only for needed permissions.  
+Pull requests are **welcome**!
+
+## Support
+If you need any assistance or find any bugs, feel free to contact me directly via email or create a
+new issue on the [projects GitHub page](https://github.com/dpacassi/view-page-source-mobile).
+
+## Other web extensions
+- [Disable JavaScript](https://github.com/dpacassi/disable-javascript)
+
+## Maintainer
+- [David Pacassi Torrico](https://pacassi.ch/) _(Web extension implementation, maintenance, support)_