Setup issue template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: bug report
+about: create a bug report
+---
+
+Your issue may already be reported!
+Please search on the [actix-extras issue tracker](https://github.com/actix/actix-extras/issues) before creating one.
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+
+* Rust Version (I.e, output of `rustc -V`):
+* Actix-* crate(s) Version:

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Gitter channel (actix)
+    url: https://gitter.im/actix/actix
+    about: Please ask and answer questions about the actix project here.