Docs: Fix typos and improve documentation

### Describe the issue or improvement

We have identified some typos and areas for improvement in our project documentation. This issue is perfect for first-time contributors who want to get started by improving the quality of our documentation.

### Suggested changes

### Task:
1. Correct the following typos and grammatical errors in the `README.md`, `CONTRIBUTING.md`, and **Co-op Translator Installation Guide**:
- "intial" -> "initial"
- Fix capitalization errors (make sure all sentences start with a capital letter).

2. Improve the **Installation Guide** section:
- Provide more detailed steps for setting up the project, especially for beginners.

3. Update the **Contributing Guide**:
- Add additional information on how contributors can get started, including helpful links to external resources if applicable.

Feel free to ask any questions if you're unsure about something. We’re here to help!

**Instructions**:
- Fork the repository.
- Make the necessary changes in the relevant documentation files.
- Submit a pull request (PR) referencing this issue.

**Resources**:
- [How to fork a repository](https://docs.github.com/en/get-started/quickstart/fork-a-repo)
- [How to create a pull request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request)

### Are you willing to submit a pull request to improve the documentation?

- [ ] I am willing to submit a pull request

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Read README.md, CONTRIBUTING.md, and the Co-op Translator Installation Guide, comparing the requested wording changes with the current text. Correct “intial,” fix sentence capitalization, and expand the installation and contributing guidance with helpful links. Done means all three documentation areas reflect the requested improvements and the changes are submitted in a pull request referencing issue 45.

Written by the indexing model from the issue text.