Add a stub chapter with all the REST flowcharts

The detailed explanations will be written at a later time.

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+REST flowcharts
+===============
+
+This chapter will explain the REST handler state machine through
+a number of different diagrams.
+
+This chapter is still under construction.
+
+Start
+-----
+
+![REST starting flowchart](rest_start.png)
+
+OPTIONS method
+--------------
+
+![REST OPTIONS method flowchart](rest_options.png)
+
+Content negotiation
+-------------------
+
+![REST content negotiation flowchart](rest_conneg.png)
+
+GET and HEAD methods
+--------------------
+
+![REST GET/HEAD methods flowchart](rest_get_head.png)
+
+PUT, POST and PATCH methods
+---------------------------
+
+![REST PUT/POST/PATCH methods flowchart](rest_put_post_patch.png)
+
+DELETE method
+-------------
+
+![REST DELETE method flowchart](rest_delete.png)
+
+Conditional requests
+--------------------
+
+![REST conditional requests flowchart](rest_cond.png)