[docs] Add "Version numbers" section in README.md file

Author: d3cim

README.md

@@ -85,6 +85,13 @@ You can contribute to this blocklist at anytime, opening an [Issue](https://gith
 
 - See [CHANGELOG](https://github.com/quindecim/dnscrypt-proxy-android/blob/master/CHANGELOG.md).
 
+## Version numbers
+
+dnscrypt-proxy-android version numbers consist of 4 parts: `MAJOR.MINOR.BUILD-PATCH`.
+
+`MAJOR`, `MINOR` and `BUILD` will be updated according to the main project, these values ​​will always be in sync with it.
+`PATCH` is an optional value that will be set on my side when I release a build before the original project.
+
 ## Donation
 
 - **ETH** address: