add instruction to run e2e test locally

Author: sinzii

e2e/zombienet/README.md

@@ -1 +1,21 @@
 # e2e tests via zombienet
+
+## Running e2e tests locally via Docker
+
+- Build Docker image
+
+```shell
+docker build -t typink-zbn --progress=plain --platform linux/amd64 --file=./e2e/zombienet/Dockerfile .
+```
+
+- Run zombienet locally
+
+```shell
+docker run -p 9944:9944 -p 9933:9933 --platform linux/amd64 typink-zbn
+```
+
+- After the zombienet network fully launched, we can now run the e2e tests
+
+```shell
+yarn workspace zombienet run e2e:test
+```