Update issue templates

Author: gmsa

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Software version (please complete the following information):**
+ - Browser [e.g. chrome, safari]
+ - Vue Version [e.g. 2.5.7]
+ - vue-grid-layout Version: [e.g. 2.3.3]
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+Please use the [CodeSandbox Template](https://codesandbox.io/s/5wy3rz5z1x?module=%2Fsrc%2FShowcaseLayout.js) to demonstrate your bug. It is much easier for us to help you if you do.
+
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## If you have a feature request, please try to implement it before requesting it. <br/>This is free software and the author is busy with other projects.
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.