Set up default protection ruleset for default and release branches (#50)

.asf.yaml

diff --git a/.asf.yaml b/.asf.yaml
index e5d8510..fa65919 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -25,6 +25,19 @@
   features:
     issues: false
 
+  rulesets:
+    - name: "Default Branch Protection"
+      type: branch
+      branches:
+        includes:
+          - "~DEFAULT_BRANCH"
+          - "release/*"
+          - "rel/*"
+        excludes: []
+      bypass_teams:
+        - root
+      restrict_deletion: true
+      restrict_force_push: true
 notifications:
-  commits:      commits@arrow.apache.org
+  commits: commits@arrow.apache.org
   pullrequests: github@arrow.apache.org