feat: add contributing.md

CONTRIBUTING.md

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+# HOW TO CONTRIBUTE
+
+We welcome contributions to this project. Please read the following guidelines.
+
+## Issues
+
+If you find a bug or have a feature request, please open an issue on [GitHub](https://github.com/TobyG74/tiktok-api-dl/issues)
+
+## How to contribute
+
+### Step 1: Fork this repository
+
+- Fork this repository by clicking on the fork button on the top of this page. This will create a copy of this repository in your account.
+
+### Step 2: Clone the repository
+
+- Now clone the forked repository to your machine. Go to your GitHub account, open the forked repository, click on the code button and then click the copy to clipboard icon.
+- Open a terminal and run the following git command:
+
+```bash
+git clone https://github.com/your-username/tiktok-api-dl.git
+```
+
+### Step 3: Create a branch
+
+- Change to the repository directory on your computer (if you are not already there):
+
+```bash
+cd tiktok-api-dl
+```
+
+- Now create a branch using the git checkout command:
+
+```bash
+git checkout -b your-new-branch-name
+```
+
+### Step 4: Make changes
+
+- Make the changes in the code as per the requirements mentioned in the issue.
+
+### Step 5: Commit all your changes
+
+- Now add the changes to the branch you just created using the git add command:
+
+```bash
+git add .
+```
+
+- Now commit those changes using the git commit command:
+
+```bash
+git commit -m "Your commit message"
+```
+
+#### Git Commit Message
+
+We structure our commit messages like this:
+
+```bash
+feat: add new feature
+fix: correct a bug
+docs: document changes
+style: formatting, missing semi colons, etc; no code change
+refactor: refactoring production code
+test: adding tests, refactoring test; no production code change
+chore: updating build tasks, package manager configs, etc; no production code change
+```
+
+Example:
+
+```bash
+git commit -m "fix: bug in TiktokAPI.ts file"
+```
+
+### Step 6: Push changes to GitHub
+
+- Push your changes using the command git push:
+
+```bash
+git push origin your-branch-name
+```
+
+### Step 7: Submit your changes for review
+
+- If you go to your repository on GitHub, you'll see a Compare & pull request button. Click on that button.
+- Now submit the pull request.
+
+## Code of Conduct
+
+Please read our [Code of Conduct](https://github.com/TobyG74/tiktok-api-dl/blob/master/CODE_OF_CONDUCT.md) before contributing.
+
+## License
+
+By contributing to tiktok-api-dl, you agree that your contributions will be licensed under its MIT license.