docs: Add initial README.md with project overview

Author: wudidapaopao

README.md

@@ -0,0 +1,8 @@
+<a href="https://chdb.io" target="_blank">
+  <img src="https://avatars.githubusercontent.com/u/132536224" width=130 />
+</a>
+
+[![chDB-ruby](https://github.com/chdb-io/chdb-ruby/actions/workflows/chdb.yml/badge.svg)](https://github.com/chdb-io/chdb-ruby/actions/workflows/chdb.yml)
+
+# chdb-ruby
+[chDB](https://github.com/chdb-io/chdb) ruby bindings and chDB cli.