added custom rule for audit team

Added rule which allows the audit team to lock particular important changes when they were created by someone who does not belong to the core-devs team

This resolves paritytech/pr-custom-review#136

.github/review-bot.yml

@@ -16,6 +16,24 @@ rules:
       - ci
       - release-engineering
 
+  - name: Audit rules
+    type: basic
+    condition:
+      include: 
+        - ^polkadot/runtime\/(kusama|polkadot|common)\/.*
+        - ^polkadot/primitives/src\/.+\.rs$
+        - ^substrate/primitives/.*
+        - ^substrate/frame/.*
+      exclude: 
+        - ^polkadot/runtime\/(kusama|polkadot)\/src\/weights\/.+\.rs$
+        - ^substrate\/frame\/.+\.md$
+    min_approvals: 2
+    allowedToSkipRule:
+      teams:
+        - core-devs
+    teams:
+      - srlabs
+
   - name: Core developers
     countAuthor: true
     condition: