Update README.md

cloudwebrtc · web-flow · commit c6013ace3133 · 2021-02-03T01:11:29.000+08:00
diff --git a/README.md b/README.md
@@ -13,11 +13,23 @@ Online Demo: https://demo.cloudwebrtc.com:8086/
 
 ### Run from source
 
-- Clone the repository, and run.  
+- Clone the repository.  
 
 ```bash
 git clone https://github.com/cloudwebrtc/flutter-webrtc-server.git
 cd flutter-webrtc-server
+```
+
+- Use `mkcert` to create a self-signed certificate.
+
+```bash
+brew install mkcert
+mkcert -key-file config/certs/key.pem -cert-file config/certs/cert.pem  localhost 127.0.0.1 ::1 0.0.0.0
+```
+
+- Run
+
+```bash
 go run cmd/server/main.go
 ```
 
