Create issue templates

Author: matklad

.github/ISSUE_TEMPLATE/blank-issue.md

@@ -0,0 +1,10 @@
+---
+name: Blank Issue
+about: Create a blank issue.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,15 @@
+---
+name: Bug report
+about: Create a bug report for rust-analyzer.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Troubleshooting guide: https://rust-analyzer.github.io/manual.html#troubleshooting
+Forum for questions: https://users.rust-lang.org/c/ide/14
+
+Please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3
+-->