Add WSL panic issue template

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

.github/ISSUE_TEMPLATE/wsl_panic.md

@@ -0,0 +1,55 @@
+---
+name: I am experiencing a panic on WSL
+about: Report a panic when using Rustup on WSL
+labels: bug
+---
+
+<!-- Please read the following very carefully and decide if you
+actually need to file this bug...
+
+WSL, specifically WSL 1, has a limitation where glibc 2.31 and
+newer will panic, fundamentally the panic will look something
+like the following:
+
+thread 'main' panicked at 'assertion failed: `(left == right)`
+  left: `22`,
+ right: `4`', src/libstd/sys/unix/thread.rs:166:21
+
+This is a bug, but it's a bug in WSL, not in Rust/Rustup and will
+affect other programs built with Rust too.  Working around it
+with Rustup will not help you until WSL (or glibc) is fixed.
+
+This is known to affect:
+
+* Ubuntu 20.04
+* Arch Linux
+
+But it may affect other versions of Linux on WSL1.
+
+You can find more information on the WSL bug report here:
+
+https://github.com/microsoft/WSL/issues/4898
+`
+If you're CERTAIN that you're not reporting yet another duplicate
+of the above issue, then...
+
+Thanks for filing a 🐛 bug report 😄! -->
+
+**Problem**
+<!-- A clear and concise description of what the bug is. -->
+<!-- including what currently happens and what you expected to happen. -->
+
+**Steps**
+<!-- The steps to reproduce the bug. -->
+1.
+2.
+3.
+
+**Possible Solution(s)**
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+**Notes**
+
+Output of `rustup --version`:
+Output of `rustup show`: