Create quick-example.md

docs/quick-example.md

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+PiCaS quick example
+============
+
+To demonstrate how pilot job PiCaS works, this page gives instructions on running a quick example which takes probably a few minutes. The quick example including four main steps: 
+  1. connect to Picas server
+  2. prepare and upload tokens to Picas server
+  3. run Picas example pilot job
+  4. check the tokens and results
+
+
+## Prerequisite
+
+Before running the example, please read the README.md in [Picas Client](https://github.com/sara-nl/picasclient/). The prerequisites are:
+  * you have installed and tested the Picas client
+  * you have a Picas account and a Picas database
+  * there is a Picas token pool server running on CouchDB.
+
+If you are following a workshop organized by SURF, the last two requirements have already been arranged for you.
+
+
+## Connect to Picas server
+
+## Prepare and upload tokens
+
+## Run Picas example
+
+## Check the tokens and results
+
+