Document Fix for V2.0.2

Author: dani007200964

Doc/markdown_pages/main_page.md

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+@mainpage Commander-API library
+**Version V2.0.1**
+
+Commander-API is a simple-to-use parser library, and you can easily use it to process character based commands and link them to a specified function. It is designed mainly to work with low memory capacity devices, for example, __small ARM or AVR processors__.
+
+## Changes in V2
+
+Version 2.X is a more refined version of the original Commander-API. The original was working well, but it was a bit flimsy when you had to work with a huge API list.
+It also caused Hard-fault when the API tree was not created correctly. Besides that, if you wanted to add a new command, you had to change the header and the source
+file as well. The biggest problem was, that it was a C-API, so no overloading, no C++ magic.
+
+The new version is designed from ground up and the main motivation was to make it as reliable as the original, but make it much simpler to use.
+
+__Key changes:__
+* Full C++ API
+* Arduino compatible without any modifications
+* Platform-IO compatibility( still in progress )
+* Simpler usage
+* Better example
+* Low memory consumption to make it compatible with lower end devices like Arduino UNO, Nano...
+* Response function overload. Thanks to C++ the response function can be anything like Serial, WiFiClient...
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.
+
+## Donation
+If this project help you reduce time to develop, you can give me a cup of coffee \emoji :coffee: \emoji :coffee: \emoji :coffee:
+
+[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/donate?hosted_button_id=YFGZD78H6K2CS)
+
+## License & copyright
+© Daniel Hajnal
+
+\emoji :email: [email protected]
+
+Licensed under the MIT License