Update README.md (#204)

Author: badmonster0

examples/code_embedding/README.md

@@ -1,4 +1,14 @@
-Simple example for cocoindex: build embedding index based on local files.
+# Build embedding index for codebase
+
+![Build embedding index for codebase](https://cocoindex.io/blogs/assets/images/cover-9bf0a7cff69b66a40918ab2fc1cea0c7.png)
+
+In this example, we will build an embedding index for a codebase using CocoIndex. CocoIndex provides built-in support for code base chunking, with native Tree-sitter support. [Tree-sitter](https://en.wikipedia.org/wiki/Tree-sitter_%28parser_generator%29) is a parser generator tool and an incremental parsing library, it is available in Rust 🦀 - [GitHub](https://github.com/tree-sitter/tree-sitter). CocoIndex has built-in Rust integration with Tree-sitter to efficiently parse code and extract syntax trees for various programming languages.
+
+
+Please give [Cocoindex on Github](https://github.com/cocoindex-io/cocoindex) a star to support us if you like our work. Thank you so much with a warm coconut hug 🥥🤗. [![GitHub](https://img.shields.io/github/stars/cocoindex-io/cocoindex?color=5B5BD6)](https://github.com/cocoindex-io/cocoindex)
+
+You can find a detailed blog post with step by step tutorial and explanations [here](https://cocoindex.io/blogs/index-code-base-for-rag).
+
 
 ## Prerequisite
 [Install Postgres](https://cocoindex.io/docs/getting_started/installation#-install-postgres) if you don't have one.