bouquets: add initial help file

docs/html/config_bouquet.html

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+<div class="hts-doc-text">
+
+<p>
+The bouquets are obtained automatically from the DVB source.
+</p>
+
+<p>
+The fastscan bouquets are pre-defined in the configuration tree. These
+bouquets must be manually enabled to let tvheadend to subscribe and listen
+to the specific MPEG-TS PIDs.
+</p>
+
+<p>
+The bouquets are listed / edited  in a grid. 
+
+<ul>
+ <li>To edit a cell, double click on it. After a cell is changed it
+     will flags one of its corner to red to indicated that it has been
+     changed. To commit these changes back to Tvheadend press the 
+     'Save changes' button. In order to change a Checkbox cell you only
+     have to click once in it.
+
+ <li>To add a new entry, press the 'Add entry' button. The new (empty) entry
+     will be created on the server but will not be in its enabled state.
+     You can now change all the cells to the desired values, check the
+     'enable' box and then press 'Save changes' to activate the new entry.
+
+ <li>To delete one or more entries, select the lines (by clicking once on 
+     them), and press the 'Delete selected' button. A popup
+     will ask you to confirm your request.
+</ul>
+</p>
+
+</div>