Update README.md

Author: elect86

README.md

@@ -5,3 +5,15 @@
 [![Release](https://jitpack.io/v/kotlin-graphics/kool.svg)](https://jitpack.io/#kotlin-graphics/kool) 
 ![Size](https://github-size-badge.herokuapp.com/kotlin-graphics/kool.svg)
 [![Github All Releases](https://img.shields.io/github/downloads/kotlin-graphics/kool/total.svg)]()
+
+Small util library featuring:
+
+- functional programming for `IntBuffer`s
+- short buffer and `CustomBuffer` plain parameters (`adr`, `pos`, `cap`, `rem`, `remSize`, `lim`)
+- buffers set operators
+- convenient conversions buffers <-> arrays
+- dummy buffer constructors: `(size: Int)` and `(size: Int, init: (Int) -> *)`
+- convenient `MemoryStack` extensions (like lambdas retrieving primitives via native memory)
+- inline classes of primitive pointers
+- `Stack` getters and setters
+- other minor utils