docs: Added intial documentation for UPM and start of a porting walkthrough

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

docs/naming.md

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+Naming a module                         {#naming}
+===============
+
+UPM attemps to follow a clear naming pattern. Modules should be sensibly named
+and then placed in /usr/lib/upm and headers in /usr/include/upm.
+
+### Choosing a name
+
+1. Pick a name
+2. Use it
+
+### Rules for name picking
+
+1. Your lib must belong to namespace UPM
+2. Usually picking the name of the chip of your sensor/actuator might make
+sense. Other times this does not. Try to pick a generic name so people with a
+similar sensor can inherit your class if they only have minor changes.
+3. Avoid brand names
+
+### Doubt
+
+If ever, give me a ping via email: brendan.le.foll@intel.com and I'll try
+suggest decent names for your module.
+