Update contributing instructions

CONTRIBUTING.md

@@ -7,6 +7,10 @@ Contributing to this project should be as easy and transparent as possible, whet
 - Submitting a fix
 - Proposing new features
 
+## IMPORTANT! Install development environment first
+
+When making changes in code, please use the existing development environment - this will save you from many errors and help create more convenient code to support. To install the environment, run the `dev-setup.sh` script.
+
 ## Github is used for everything
 
 Github is used to host code, to track issues and feature requests, as well as accept pull requests.

LICENSE.md

@@ -2,7 +2,7 @@
 
 # Attribution-NonCommercial-ShareAlike 4.0 International License
 
-Copyright (c) 2019 Andrey "Limych" Khrolenok
+Copyright (c) 2019–2020 Andrey "Limych" Khrolenok
 
 Creative Commons Corporation (“Creative Commons”) is not a law firm and does not provide legal services or legal advice. Distribution of Creative Commons public licenses does not create a lawyer-client or other relationship. Creative Commons makes its licenses and related information available on an “as-is” basis. Creative Commons gives no warranties regarding its licenses, any material licensed under their terms and conditions, or any related information. Creative Commons disclaims all liability for damages resulting from their use to the fullest extent possible.
 

README.md

@@ -102,5 +102,28 @@ custom_updater:
     - https://raw.githubusercontent.com/Limych/ha-car_wash/master/tracker.json
 ```
 
+## Contributions are welcome!
+
+This is an active open-source project. We are always open to people who want to
+use the code or contribute to it.
+
+We have set up a separate document containing our
+[contribution guidelines](CONTRIBUTING.md).
+
+Thank you for being involved! :heart_eyes:
+
+## Authors & contributors
+
+The original setup of this component is by [Andrey "Limych" Khrolenok][limych].
+
+For a full list of all authors and contributors,
+check [the contributor's page][contributors].
+
+## License
+
+creative commons Attribution-NonCommercial-ShareAlike 4.0 International License
+
+See separate [license file](LICENSE.md) for full text.
+
 [forum-support]: https://community.home-assistant.io/t/car-wash-binary-sensor/110046
 [hacs]: https://github.com/custom-components/hacs