Add releated projects to readme

Author: k4m4

readme.md

@@ -48,6 +48,12 @@ Only match an exact string. Useful with `RegExp#test()` to check if a string is
 - [bitcoin-regex](https://github.com/kevva/bitcoin-regex) - ethereum-regex was inspired by this project by [kevva](https://github.com/kevva).
 - [ip-regex](https://github.com/sindresorhus/ip-regex) - most of the documentation format has been adapted from this project by [sindresorhus](https://github.com/sindresorhus).
 
+## Related
+
+- [litecoin-regex](https://github.com/k4m4/litecoin-regex) - Regular expression for matching Litecoin (LTC) addresses.
+- [bitcoincash-regex](https://github.com/k4m4/bitcoincash-regex) - Regular expression for matching Bitcoin Cash (BCH) addresses.
+- [dash-regex](https://github.com/k4m4/dash-regex) - Regular expression for matching Dash addresses.
+- [dogecoin-regex](https://github.com/k4m4/dogecoin-regex) - Regular expression for matching Dogecoin (DOGE) addresses.
 
 ## License