Add the template for Knative projects (knative#255)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug
+about: Create a bug report to help us improve
+title: ''
+labels: kind/bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Knative release version**
+The Knative version, where you find this issue.
+
+**Additional context**
+Add any other context about the problem here such as proposed priority

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: "Suggest an idea for this project\tabout"
+title: ''
+labels: kind/feature-request
+assignees: ''
+
+---
+
+**Problem**
+A short explanation of the problem, including relevant restrictions.
+
+**[Persona:](https://github.com/knative/eventing/blob/master/docs/personas.md)**
+Which persona is this feature for?
+
+**Exit Criteria**
+A measurable (binary) test that would indicate that the problem has been resolved.
+
+**Time Estimate (optional):**
+How many developer-days do you think this may take to resolve?
+
+**Additional context (optional)**
+Add any other context about the feature request here.

.github/issue-template.md

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+# Issue Description
+
+## Expected Behavior
+
+## Actual Behavior
+
+## Steps to Reproduce the Problem
+
+1.
+2.
+3.
+
+## Additional Info