added CONTRIBUTING.md file

Author: rohit8020

CONTRIBUTING.md

@@ -0,0 +1,55 @@
+##  `Steps To Generate PR(Pull Request)`
+
+- (Star ⭐ & Fork 🍽️) this repository.
+- Follow [rohit8020](https://www.github.com/rohit8020) get it merged fast.
+# 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.
+
+# Clone the repository
+
+Now clone the forked repository to your system. Go to your GitHub account, open the forked repository, click on the code button and then clone the repository.
+
+*if you want to use the terminal, use the following commands*
+after you fork the repository , open the terminal type the given command
+```
+git clone https://github.com/{your-github-username}/css-loaders.git
+
+```
+
+# Create a branch
+
+Then create a branch on your local repository to solve a problem.
+
+*terminal commands*
+```
+git checkout -b your_new_branch_name
+
+```
+
+
+# Add & commit
+
+Add your changes(folder) to that branch. <br/>
+Make necessary changes and commit those changes. 
+*terminal commands*
+```
+git add .
+git commit -m "your-commit-message"
+
+```
+
+# Push changes to GitHub
+
+Finally push your local repository to remote repository
+Compare & Submit a Pull Request
+
+*terminal commands*
+```
+git push origin <branch-name>
+
+```
+
+Then go to your repository on GitHub, you'll see a Compare & pull request button. Click on that button.
+
+Now submit the pull request.