Add similar projects to README.md

Add Kong (a C# port of Bowser) to the similar projects section of README.md.

README.md

@@ -201,5 +201,8 @@ See the list in `src/useragents.js` with example user agents and their expected
 Whenever you add support for new browsers or notice a bug / mismatch, please update the list and
 check if all tests are still passing.
 
+### Similar Projects
+* [Kong](https://github.com/BigBadBleuCheese/Kong) - A C# port of Bowser.
+
 ### License
 Licensed as MIT. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE file for more details.