Create issue templates (#321)

* Create bug_report.md

* Create feature_request.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+## Bug report
+
+Summarize what you were trying to do when the issue appeared.
+
+**To Reproduce**
+
+Summarize how to reproduce the behavior. For example:
+1. Make a terragrunt file that calls the function `foo`
+2. Run the command `terragrunt-atlantis-config --example`
+
+**Expected behavior**
+
+No error. I expected the generated Atlantis config to look like:
+```
+example good config
+```
+
+**Actual behavior**
+
+Describe what happened and why it had a negative impact.
+```
+example bad config or error
+```
+
+**Relevant Terragrunt files**
+
+Please provide at least a snippet of relevant terragrunt code that is causing terragrunt-atlantis-config to fail.
+Ideally, a link to a repository with the smallest set of code needed to reproduce the issue.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose a new feature
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Feature Request
+
+- [ ] I'd be willing to implement this feature
+
+**Describe the idea**
+
+
+**Why is this helpful?**
+
+
+**What alternatives exist today?**
+