🚀 added contributing guide and PR Template

Author: vivek12345

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Please make sure you are familiar with and follow the instructions in the
+contributing guidelines (found in the CONTRIBUTING.md file).
+
+Please fill out the information below to expedite the review and (hopefully)
+merge of your pull request!
+-->
+
+<!-- Is it a Bug fix, feature, docs update, ... -->
+**What kind of change does this PR introduce?**
+
+<!-- You can also link to an open issue here -->
+**What is the current behavior?**
+
+<!-- if this is a feature change -->
+**What is the new behavior?**
+
+
+<!-- Have you done all of these things?  -->
+**Checklist**:
+<!-- add "N/A" to the end of each line that's irrelevant to your changes -->
+<!-- to check an item, place an "x" in the box like so: "- [x] Documentation" -->
+- [ ] Documentation
+- [ ] Tests
+- [ ] Ready to be merged <!-- In your opinion, is this ready to be merged as soon as it's reviewed? -->
+- [ ] Added myself to contributors table <!-- this is optional, see the contributing guidelines for instructions -->
+
+<!-- feel free to add additional comments -->
+
+<!-- Thank you for contributing! -->

CONTRIBUTING.md

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+## Setting Up the project locally
+
+To install the project you need to have `yarn` and `node`
+
+1.  [Fork](https://help.github.com/articles/fork-a-repo/) the project, clone your fork:
+
+    ```
+    # Clone your fork
+    git clone https://github.com/<your-username>/react-polling.git
+
+    # Navigate to the newly cloned directory
+    cd react-polling
+    ```
+
+2.  `yarn` to install dependencies
+3.  `yarn build` to build the UMD and ES bundle of the app
+    
+
+> Tip: Keep your `master` branch pointing at the original repository and make
+> pull requests from branches on your fork. To do this, run:
+>
+> ```
+> git remote add upstream https://github.com/vivek12345/react-polling.git
+> git fetch upstream
+> git branch --set-upstream-to=upstream/master master
+> ```
+>
+> This will add the original repository as a "remote" called "upstream,"
+> Then fetch the git information from that remote, then set your local `master`
+> branch to use the upstream master branch whenever you run `git pull`.
+> Then you can make all of your pull request branches based on this `master`
+> branch. Whenever you want to update your version of `master`, do a regular
+> `git pull`.
+
+## Submitting a Pull Request
+
+Please go through existing issues and pull requests to check if somebody else is already working on it, we use `someone working on it` label to mark such issues.
+
+Also, make sure to run the tests and lint the code before you commit your changes.
+
+```
+yarn test
+yarn lint
+```
+
+## Add yourself as a contributor
+
+This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!
+
+To add yourself to the table of contributors on the `README.md`, please use the
+automated script as part of your PR:
+
+```
+yarn add-contributor
+```
+
+Follow the prompt and commit `.all-contributorsrc` and `README.md` in the PR.
+
+Thank you for taking the time to contribute! :+1: