added readme file.

README.md

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+[![Open Source Love](https://badges.frapsoft.com/os/v1/open-source.svg?v=103)](https://github.com/ellerbrock/open-source-badges/)
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
+[![Open Source Helpers](https://www.codetriage.com/devncode/first-contributions/badges/users.svg)](https://www.codetriage.com/devncode/first-contributions)
+
+# First Contribution
+
+- Thinking about doing open source contribution?
+- Don't know where to start or how to do?
+- Looking for a simple repository to get started?
+
+Then look no further, we created this repository to get started.
+
+## just for the instruction!
+
+<img align="right" width="300" src="assets/fork.png" alt="fork this repository" />
+
+If you don't have git on your machine, [install it]( https://help.github.com/articles/set-up-git/).
+
+## 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
+
+<img align="right" width="300" src="assets/clone.png" alt="clone this repository" />
+
+Now clone the forked repository to your machine. Go to your GitHub account, open the forked repository, click on the clone button and then click the *copy to clipboard* icon.
+
+Open a terminal and run the following git command:
+
+```
+git clone "url you just copied"
+```
+
+<img align="right" width="300" src="assets/copy-to-clipboard.png" alt="copy URL to clipboard" />
+
+For example:
+```
+git clone https://github.com/this-is-you/first-contributions.git
+```
+where `this-is-you` is your GitHub username. Here you're copying the contents of the first-contributions repository in GitHub to your computer.
+
+## Create a branch
+
+Change to the repository directory on your computer (if you are not already there):
+
+```
+cd first-contributions
+```
+Now create a branch using the `git checkout` command:
+```
+git checkout -b <add-your-new-branch-name>
+```
+
+For example:
+```
+git checkout -b add-muhammad
+```
+(The name of the branch does not need to have the word *add* in it, but it's a reasonable thing to include because the purpose of this branch is to add your name to a list.)
+
+## Make necessary changes and commit those changes
+
+Now open `contributions.yml` file from `_data` directory in a text editor, add your name, github_account and profile picture url (avatar) to it. Don't add it at the beginning or end of the file. Put it anywhere in between. Now, save the file.
+
+<img align="right" width="450" src="assets/git-status.png" alt="git status" />
+
+
+If you go to the project directory and execute the command `git status`, you'll see there are changes.
+
+
+Add those changes to the branch you just created using the `git add` command:
+
+```
+git add Contributors.md
+```
+
+Now commit those changes using the `git commit` command:
+```
+git commit -m "Add <your-name> to Contributors list"
+```
+replacing `<your-name>` with your name.
+
+## Push changes to GitHub
+
+Push your changes using the command `git push`:
+```
+git push origin <add-your-branch-name>
+```
+replacing `<add-your-branch-name>` with the name of the branch you created earlier.
+
+## 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.
+
+<img style="float: right;" src="assets/compare-and-pull.png" alt="create a pull request" />
+
+Now submit the pull request.
+
+<img style="float: right;" src="assets/submit-pull-request.png" alt="submit pull request" />
+
+Soon I'll be merging all your changes into the master branch of this project. You will get a notification email once the changes have been merged.