Add issue templates (#96)

Author: clausherther

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: I think I've found a bug
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+### Is this a new bug in dbt-date?
+
+- [ ] I believe this is a new bug in dbt-date
+- [ ] I have searched the existing issues, and I could not find an existing issue for this bug
+
+### Current Behavior
+
+### Expected Behavior
+
+### Steps To Reproduce
+
+### Relevant log output
+
+### Environment
+
+```markdown
+- OS:
+- Python:
+- dbt:
+- dbt-expectations:
+```
+
+### Which database adapter are you using with dbt?
+
+Note: dbt-date currently does not support database adapters other than the ones listed below.
+
+- Postgres
+- Snowflake
+- BigQuery
+
+### Additional Context

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for dbt-date
+title: '[Feature Request]'
+labels: ''
+assignees: ''
+
+---
+
+**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.