add some bages (#5)

Author: nerdai

README.md

@@ -1 +1,6 @@
 # LLM Agents From Scratch
+
+---------------------------------------------------------------------------------------
+[![Linting](https://github.com/nerdai/llm-agents-from-scratch/actions/workflows/lint.yml/badge.svg)](https://github.com/nerdai/llm-agents-from-scratch/actions/workflows/lint.yml)
+[![Unit Testing and Upload Coverage](https://github.com/nerdai/llm-agents-from-scratch/actions/workflows/unit_test.yml/badge.svg)](https://github.com/nerdai/llm-agents-from-scratch/actions/workflows/unit_test.yml)
+[![codecov](https://codecov.io/gh/nerdai/llm-agents-from-scratch/graph/badge.svg?token=I1CXFJXEXK)](https://codecov.io/gh/nerdai/llm-agents-from-scratch)