Create ISSUE_TEMPLATE.md

Author: oreoshake

.github/ISSUE_TEMPLATE.md

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+# Feature Requests
+
+## Adding a new header
+
+Generally, adding a new header is always OK. 
+
+* Is the header supported by any user agent? If so, which?
+* What does it do?
+* What are the valid values for the header?
+* Where does the specification live?
+
+## Adding a new CSP directive
+
+* Is the directive supported by any user agent? If so, which?
+* What does it do?
+* What are the valid values for the directive?
+
+---
+
+# Bugs
+
+Console errors and deprecation warnings are considered bugs that should be addressed with more precise UA sniffing. Bugs caused by incorrect or invalid UA sniffing are also bugs.
+
+### Expected outcome
+
+Describe what you expected to happen 
+
+1. I configure CSP to do X
+1. When I inspect the response headers, the CSP should have included X
+
+### Actual outcome
+
+1. The generated policy did not include X
+
+### Config
+
+Please provide the configuration (`SecureHeaders::Configuration.default`) you are using including any overrides (`SecureHeaders::Configuration.override`).
+
+### Generated headers
+
+Provide a sample response containing the headers