Improve read me
Improve read me

yotta link example, clarify why you sometimes git clone and sometimes yotta install something
autopulated/yotta,eyeye/yotta,ARMmbed/yotta,ntoll/yotta,stevenewey/yotta,stevenewey/yotta,ARMmbed/yotta,autopulated/yotta,theotherjimmy/yotta,BlackstoneEngineering/yotta,BlackstoneEngineering/yotta,bridadan/yotta,theotherjimmy/yotta,ntoll/yotta,bridadan/yotta,iriark01/yotta,iriark01/yotta,eyeye/yotta