Add GitHub issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,32 @@
+Before submitting this issue, please first:
+
+- [ ] Search the existing issues.
+- [ ] Refer to the [FAQ](../docs/FAQ.md).
+- [ ] Refer to the [known issues](../docs/KNOWNISSUES.md).
+- [ ] If it is a bug, fill out this form:
+
+Steps to reproduce
+------------------
+
+
+Expected behavior
+-----------------
+
+
+Actual behavior
+---------------
+
+
+Environment data
+----------------
+
+Please fill in the results of the following commands:
+
+```sh
+$ dotnet --info
+
+
+$ git status
+
+
+```