[ENH] Enhance README with project details, usage instructions, and li…

…cense information

* Add project title and description
* Include CI, PyPI version, Python version, and license badges
* Provide installation instructions using pip
* Explain usage of commitai command-line tool
  - Describe the purpose and functionality of commitai
  - Mention the supported AI language models (GPT-4 and Claude)
* Add sections for setting environment variables and creating custom templates
  - Provide examples for setting API keys and global commit template
  - Explain how to create a repository-specific template using the `create-template` command
* Include license information and link to the LICENSE file

Co-authored-by: Comai <github.com/lguibr/comai>

README.md

@@ -1,4 +1,9 @@
-# commitai - Commit Message AI
+# CommitAi - Commit Message AI
+
+[![CI](https://github.com/lguibr/comai/workflows/CI/badge.svg)](https://github.com/lguibr/comai/actions)
+[![PyPI](https://img.shields.io/pypi/v/comai.svg)](https://pypi.org/project/comai/)
+[![Python Version](https://img.shields.io/pypi/pyversions/comai.svg)](https://pypi.org/project/comai/)
+[![License](https://img.shields.io/pypi/l/comai.svg)](https://github.com/lguibr/comai/blob/main/LICENSE)
 
 commitai is a command-line tool that helps you generate informative and relevant commit messages for your Git repositories using AI language models like GPT-4 and Claude. It analyzes your staged changes, combines them with a high-level explanation provided by you, and creates a commit message based on this information. Additionally, it supports custom commit message templates and a back command to reset to previous commits. This not only saves you time and effort but also ensures a consistent and meaningful commit history.
 
@@ -30,11 +35,6 @@ export TEMPLATE_COMMIT="My global custom template: {message}"
 
 #### Creating a Template for the Repository
 
-[![CI](https://github.com/lguibr/comai/workflows/CI/badge.svg)](https://github.com/lguibr/comai/actions)
-[![PyPI](https://img.shields.io/pypi/v/comai.svg)](https://pypi.org/project/comai/)
-[![Python Version](https://img.shields.io/pypi/pyversions/comai.svg)](https://pypi.org/project/comai/)
-[![License](https://img.shields.io/pypi/l/comai.svg)](https://github.com/lguibr/comai/blob/main/LICENSE)
-
 You can create a custom template specific to the repository using the `create-template` command. This template will override the global template set in the `TEMPLATE_COMMIT` environment variable if present.
 
 commitai create-template "My repository-specific template: {message}"