Created template file for new issues

Created template file for pull requests

updated with @beefchimi suggestions

.github/ISSUE_TEMPLATE.md

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+> Please use this template to help contributors get a detailed description of the issue or feature.
+
+**For support questions, please use stackoverflow.** This repository's issues are reserved for feature requests and bug reports.
+
+### 1. Apply either the `bug` or `feature-request` label
+
+_Select appropriate label in right sidebar..._
+
+### 2. Describe the `bug` or `feature`
+
+_Feature or expected behaviour explanation..._
+
+### 3. If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem
+
+_Please remember that with sample code it's easier to reproduce the bug and it's much faster to fix it._
+
+### 4. Please tell us about your environment:
+
+* **Library version:** [1.0.0-beta.X | v1 stable | etc...]
+* **Browsers:** [all | Chrome vX | Firefox vX | Safari vX | Edge vX | iOS vX | Android vX | etc...]
+* **Tech stack:** [all | TypeScript vX | ES6/7 | ES5 | React | etc...]
+* **Other information:** [Detailed explanation | Stacktraces | Related issues | Suggestions how to fix | Links for us to have context | etc...]

.github/PULL_REQUEST_TEMPLATE.md

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+> Thank you for submitting a pull request! Please make sure you have read the [contribution guidelines](https://github.com/Shopify/draggable/blob/master/CONTRIBUTING.md) before proceeding.
+
+### This PR implements or fixes... _(explain your changes)_
+
+…
+
+### This PR closes the following issues... _(if applicable)_
+
+…
+
+### Does this PR require the Docs to be updated?
+
+…
+
+### Does this PR require new tests?
+
+…
+
+### This branch been tested on... _(click all that apply / add new items)_
+
+**Browsers:**
+
+* [ ] Chrome _version_
+* [ ] Firefox _version_
+* [ ] Safari _version_
+* [ ] IE / Edge _version_
+* [ ] iOS Browser _version_
+* [ ] Android Browser _version_