Just added 0.0.1b version info, and demo command

Author: jormc

README.md

@@ -1,2 +1,44 @@
 # z21
-A Z21 client library 
+A Z21 client library made with Nodejs & Typescript to connect via http / udp protocols with the connected device(s).
+
+<br />
+
+## How does it works?
+
+In this version only two ts files are included:
+
+* ***src/z21Client.ts:*** this is the main Z21 udp client, only the <code>*public sendRequest(command: Buffer): Promise<Buffer>*</code> function is supported by the now
+* ***src/app.ts:*** this is the main app file, just gets the Z21 serial number
+
+<br />
+
+## Test this version
+
+On this version you can simply use the ***app.ts*** module that uses the ***z21Client.ts***.
+
+Launch the demo app with:
+
+    $ npm run demo
+
+and see what's happend...
+
+
+<br />
+
+## Next steps
+
+Work is in progres...
+
+Any contribution will be welcome :-) 
+
+
+<br />
+
+---
+
+<br />
+
+## Revisions
+
+* **0.0.1b (2022-02-01)** 
+  > First version of the library. Project is started, including a very very simple udp socket client that connects with the Z21 device and accepts http requests. Also a very very simple app that uses this client is included.