[ADD] Understanding RISC-V Assembly Language by Building an Assembler…

… in C#

#codecrafters-io#937

README.md

@@ -297,6 +297,7 @@ It's a great way to learn.
 * [**C++**: _Writing Your Own Toy Compiler Using Flex_](https://gnuu.org/2009/09/18/writing-your-own-toy-compiler/)
 * [**C++**: _How to Create a Compiler_](https://www.youtube.com/watch?v=eF9qWbuQLuw) [video]
 * [**C++**: _Kaleidoscope: Implementing a Language with LLVM_](https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/index.html)
+* [**C#**: _Understanding RISC-V Assembly Language by Building an Assembler in C#](https://hackernoon.com/understanding-risc-v-assembly-language-by-building-an-assembler-in-c)
 * [**F#**: _Understanding Parser Combinators_](https://fsharpforfunandprofit.com/posts/understanding-parser-combinators/)
 * [**Elixir**: _Demystifying compilers by writing your own_](https://www.youtube.com/watch?v=zMJYoYwOCd4) [video]
 * [**Go**: _The Super Tiny Compiler_](https://github.com/hazbo/the-super-tiny-compiler)