Update ideas

ideas.md

@@ -96,6 +96,14 @@ In the real-world, working with external data in file systems and databases is o
 - ~~*Languages* (regular, context-free) at the language heart~~
   - *Probably* nonsense
 
+## Parallelity
+
+Should be implicit in pure calculations and easilty explicitly possible for IO.
+
+## Compiler
+
+Implement a algebraic compiler using `megaparsec` for parsing in Haskell and later write a compiler in Katrin itself.
+
 ## Meta-Usability
 
 ### Tooling
@@ -153,6 +161,7 @@ Debugging needs to be easy and comprehensive.
 - Clojure
 - F#
 - Scala
+- Kotlin
 - Nix (not a programming languae per se)
 - Nim
 - Elm