chore: Added issue & PR templates

Author: LuisThein

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: LuisThein
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**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.
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - Version [e.g. 22]
+
+**flutter doctor**
+Please add the `flutter doctor` output.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: LuisThein
+
+---
+
+**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.

.github/PULL_REQUEST_TEMPLATE.md

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+*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*
+
+*List which issues are fixed by this PR.*
+
+## Pre-launch Checklist
+
+- [ ] I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
+- [ ] I updated CHANGELOG.md to add a description of the change.
+- [ ] I updated/added relevant documentation (doc comments with `///`).
+- [ ] I added new tests to check the change I am making if a test is possible.
+- [ ] All existing and new tests are passing.