compiler: build separation runtime with clite

runtime/internal/clite/zlib/README.md

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+# LLGo wrapper of madler/zlib
+
+## How to install
+
+### on macOS (Homebrew)
+
+```sh
+brew install zlib
+```
+
+### on Linux (Debian/Ubuntu)
+
+```sh
+TODO
+```
+
+## Demos
+
+The `_demo` directory contains our demos (it start with `_` to prevent the `go` command from compiling it):
+
+- [normal](_demo/normal/compress.go): a basic zlib demo
+
+### How to run demos
+
+To run the demos in directory `_demo`:
+
+```sh
+cd <demo-directory>  # eg. cd _demo/normal
+llgo run .
+```