Add README.md

README.md

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+# Test websockets
+
+## How to run
+
+```
+// compilation of .mts files in watch mode
+$ tsc -w
+
+// serve static files (localhost:8000)
+$ python serve.py
+
+// run server
+$ node server.mjs
+```
+
+Go to http://localhost:8000
+