Make branch protection and review required back. (#12)

.asf.yaml

@@ -31,3 +31,12 @@ github:
     squash:  true
     merge:   false
     rebase:  false
+  protected_branches:
+    main:
+      required_status_checks:
+        strict: true
+        contexts:
+          - Build
+      required_pull_request_reviews:
+        dismiss_stale_reviews: true
+        required_approving_review_count: 1

README.md

@@ -25,6 +25,10 @@ Please head to the [releases page](https://skywalking.apache.org/downloads/) to
 
 The agent binary package is generated in `skywalking-agent` folder.
 
+Set **Generated Source Codes**(`grpc-java` and `java` folders in **apm-protocol/apm-network/target/generated-sources/protobuf**) 
+folders if you are using IntelliJ IDE.
+
+
 # Code of conduct
 This project adheres to the Contributor Covenant [code of conduct](https://www.apache.org/foundation/policies/conduct). By participating, you are expected to uphold this code.
 Please follow the [REPORTING GUIDELINES](https://www.apache.org/foundation/policies/conduct#reporting-guidelines) to report unacceptable behavior.