Add some more stuff to the custom silicon idea

projects/hardware/custom-silicon.md

@@ -4,5 +4,12 @@ Related maybe also get started with FPGA stuf.
 
 But I do not yet have a good idea for the actual use-case
 
+## Use-Case Ideas
+### Risc-V
+This is kind of an obvious option, as it is free and open in terms of the actual ISA and there are other projects already doing this.
+
+### WebAssembly
+It might be interesting to try and create a CPU for WebAssembly directly
+
 ## Resources
 - [Tiny Tapeout](https://tinytapeout.com/)