Add archive PR template to stop people posting here before I finish locking it (#3652)

hamishwillee · web-flow · commit 97977c832927 · 2025-03-20T10:06:01.000+11:00
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,3 @@
+This repository is in the process of being archived.
+
+Please post your docs PRs (and issues) into https://github.com/PX4/PX4-Autopilot/docs

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+This repository is in the process of being archived.`
	`2`	`+`
	`3`	`+Please post your docs PRs (and issues) into https://github.com/PX4/PX4-Autopilot/docs`