docs: Symlink changes checklist to CONTRIBUTING.md

Help people navigate the process by exploiting a common place to look
for how to make changes.

Change-Id: Ie6f28e0de9c62bcda4a8e0c72b31fdb6616b963e
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 120000
index 0000000..b4d357f
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1 @@
+docs/checklists/changes.md
\ No newline at end of file