Update README

Author: GeekMasher

README.md

@@ -25,3 +25,21 @@ CodeQL Dependency Graph Action
 - name: Perform CodeQL Analysis
   uses: github/codeql-action/analyze@v2
 ```
+
+## Features
+
+| Language   | Query                                   | Completeness               |
+| ---------- | --------------------------------------- | -------------------------- |
+| C/C++      | :white_check_mark: [query](./ql/cpp)    | :large_orange_diamond: [1] |
+| C#         | :red_circle:                            |                            |
+| Go         | :red_circle:                            |                            |
+| Java       | :white_check_mark: [query](./ql/java)   | :white_check_mark: [2]     |
+| JavaScript | :red_circle:                            |                            |
+| Python     | :white_check_mark: [query](./ql/python) | :large_orange_diamond: [3] |
+| Ruby       | :red_circle:                            |                            |
+
+*Notes:*
+
+1. C/C++ information is incomplete. The query is able to some data on dependencies, but the information is not complete. This is due to the fact that the CodeQL C/C++ extractor does not extract all the information needed to build a complete the dependency information.
+2. Java information is pretty complete. Both Gradle and Maven are supported well.
+3. Python's data is incomplete. Not all the information is available to build a complete dependency graph.