Update CONTRIBUTING.md

Author: AnonymousX86

docs/CONTRIBUTING.md

@@ -1,4 +1,9 @@
 # How to contribute in a good way?
-At first, please specify what code **exacly** should be chnages.
-You can also provide product version if you were using build.
-Any help is appreciated.
+Best option would be editing existing code or adding new files by pull requests.
+Also you can make just an issue if you're not sure what's wrong or where to find specific function.
+### Help is very welcome.
+
+## Adding new locales
+From version `0.2.5` program is using translations. If you wat to add translation, please copy
+[english locale file](https://github.com/AnonymousX86/Python-Password/blob/master/python_password/translations/locales/en.json),
+(or any other locale JSON) edit it and make a pull request with adding edited file.