Update test section for web-client

README.md

@@ -14,6 +14,14 @@ Client library for communication from browser and *Near blockchain*. It's a high
 wasm-pack build web-client --target bundler --out-dir ../pkg
 ```
 
+### Test
+
+> Pre requirements:
+> Clone a `key-exchange-server` and `near-smartcontracts`.
+> Deploy their docker instances
+
+`docker-compose up`
+
 ## Diagrams
 ```mermaid
 sequenceDiagram