Add issue templates ported from rust-clippy

.github/ISSUE_TEMPLATE/blank_issue.md

@@ -0,0 +1,4 @@
+---
+name: Blank Issue
+about: Create a blank issue.
+---

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,25 @@
+---
+name: Bug Report
+about: Create a bug report for Rust GCC
+labels: bug
+---
+<!--
+Thank you for filing a bug report! 🐛 Please provide a short summary of the bug,
+along with any information you feel relevant to replicating the bug.
+-->
+
+I tried this code:
+
+```rust
+<code>
+```
+
+I expected to see this happen: *explanation*
+
+Instead, this happened: *explanation*
+
+### Meta
+
+- What version of Rust GCC were you using, git sha if possible.
+
+

.github/ISSUE_TEMPLATE/ice.md

@@ -0,0 +1,42 @@
+---
+name: Internal Compiler Error
+about: Create a report for an internal compiler error in Rust GCC.
+labels: bug, ICE
+---
+<!--
+Thank you for finding an Internal Compiler Error! 🧊  If possible, try to provide
+a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for
+how to create smaller examples.
+
+http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/
+
+-->
+
+### Code
+
+```rust
+<code>
+```
+
+### Meta
+
+- What version of Rust GCC were you using, git sha if possible.
+
+### Error output
+
+```
+<output>
+```
+
+<!--
+Include a backtrace if available.
+-->
+<details><summary>Backtrace</summary>
+  <p>
+  
+  ```
+  <backtrace>
+  ```
+  
+  </p>
+</details>

.github/PULL_REQUEST_TEMPLATE.md

@@ -8,6 +8,7 @@ in the git commit message.
 
 Here is a checklist to help you with your PR.
 
+- \[ ] GCC code require copyright assignment: https://gcc.gnu.org/contribute.html
 - \[ ] Read contributing guidlines
 - \[ ] `make check-rust` passes locally
 - \[ ] Run `clang-format`