Add GitHub template (#3032)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,38 @@
+<!-- Please reserve GitHub issues for bug reports and feature requests.
+
+For questions, the best place to get answers is on our [mailing list](https://groups.google.com/forum/#!forum/vault-tool), as they will get more visibility from experienced users than the issue tracker.
+
+Please note: We take Vault's security and our users' trust very seriously. If you believe you have found a security issue in Vault, please responsibly disclose by contacting us at security@hashicorp.com.
+-->
+
+
+<!-- Uncomment this section if this is a feature request. Include or exclude other sections as deemed appropriate.
+**Feature Request:**
+-->
+
+**Environment:**
+<!-- The version can be retrieved with `vault version`. -->
+
+* Vault Version:
+* Operating System/Architecture:
+
+**Vault Config File:**
+<!-- Configuration file used for the vault server. -->
+
+**Startup Log Output:**
+<!-- Logs from vault's output on startup, if available. -->
+
+**Expected Behavior:**
+<!-- What should have happened? -->
+
+**Actual Behavior:**
+<!-- What actually happened? -->
+
+**Steps to Reproduce:**
+<!-- List the steps required to reproduce the issue. -->
+
+**Important Factoids:**
+<!-- Describe any atypical environment setup, if any. -->
+
+**References:**
+<!-- Link to any references, such as GitHub issues or pull requests. -->