Add issue, pr templates

.github/issue_template/bug_report.md

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+---
+name: Bug report
+about: Report a bug or an issue you've found with dbt-docs
+title: ''
+labels: bug, triage
+assignees: ''
+
+---
+
+### Describe the bug
+A clear and concise description of what the bug is. What command did you run? What happened?
+
+### 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 behavior
+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.
+
+**The output of `dbt --version`:**
+```
+<output goes here>
+```
+
+### Additional context
+Add any other context about the problem here.

.github/issue_template/enhancement.md

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+---
+name: Feature request
+about: Suggest an idea for dbt-docs
+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 write some code, and how we can help.

.github/pull_request_template.md

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+resolves #
+
+<!---
+  Include the number of the issue addressed by this PR above if applicable.
+  PRs for code changes without an associated issue *will not be merged*.
+  See CONTRIBUTING.md for more information.
+
+  Example:
+    resolves #1234
+-->
+
+
+### Description
+
+<!--- Describe the Pull Request here -->
+
+
+### Checklist
+ - [ ] I have signed the [CLA](https://docs.getdbt.com/docs/contributor-license-agreements)
+ - [ ] I have generated docs locally, and this change appears to resolve the stated issue
+ - [ ] I have updated the `CHANGELOG.md` and added information about my change to the "dbt next" section.
+