add github issue and pr templates

.github/CODEOWNERS

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+*       @mjirv

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug or an issue you've found with this package
+title: ''
+labels: bug, triage
+assignees: ''
+
+---
+
+### Describe the bug
+<!---
+A clear and concise description of what the bug is. You can also use the issue title to do this
+--->
+
+### Steps to reproduce
+<!---
+In as much detail as possible, please provide steps to reproduce the issue. Sample data that triggers the issue, example model code, etc is all very helpful here.
+--->
+
+### Expected results
+<!---
+A clear and concise description of what you expected to happen.
+--->
+
+### Actual results
+<!---
+A clear and concise description of what you expected to happen.
+--->
+
+### Screenshots and log output
+<!---
+If applicable, add screenshots or log output to help explain your problem.
+--->
+
+### System information
+**The contents of your `packages.yml` file:**
+
+**Which database are you using dbt with?**
+- [ ] postgres
+- [ ] redshift
+- [ ] bigquery
+- [ ] snowflake
+- [ ] other (specify: ____________)
+
+
+**The output of `dbt --version`:**
+```
+<output goes here>
+```
+
+
+### Additional context
+<!---
+Add any other context about the problem here. For example, if you think you know which line of code is causing the issue.
+--->
+
+### Are you interested in contributing the fix?
+<!---
+Let us know if you want to contribute the fix, and whether would need a hand getting started
+--->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this package
+title: ''
+labels: enhancement, triage
+assignees: ''
+
+---
+
+### Describe the feature
+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
+Is this feature database-specific? Which database(s) is/are relevant? Please include any other relevant context here.
+
+### Who will this benefit?
+What kind of use case will this feature be useful for? Please be specific and provide examples, this will help us prioritize properly.
+
+### Are you interested in contributing this feature?
+<!---
+Let us know if you want to contribute the feature, and whether would need a hand getting started
+--->

.github/pull_request_template.md

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+This is a:
+- [ ] bug fix PR with no breaking changes
+- [ ] new functionality
+- [ ] a breaking change
+
+## Description & motivation
+<!---
+Describe your changes, and why you're making them.
+-->
+
+## Checklist
+- [ ] I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
+    - [ ] BigQuery
+    - [ ] Postgres
+    - [ ] Redshift
+    - [ ] Snowflake
+- [ ] I have updated the README.md (if applicable)
+- [ ] I have added tests & descriptions to my macros (and models if applicable)