Changes for page ROS Crash Course

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...	...	@@ -101,3 +101,34 @@
101	101	quick reading of code for publisher node
102	102
103	103	homework: implement message subscriber node according to ROS book
	104	+
	105	+== Day 4 ==
	106	+
	107	+message subscriber.
	108	+
	109	+argc and agrv
	110	+
	111	+node name during ros::init
	112	+
	113	+topic advertise/subscribe explained.
	114	+
	115	+subscribe() only memorises that this node wants messages and what to do with them.
	116	+
	117	+subscribe() - providing name of function. not calling.
	118	+
	119	+publisher while ros::ok() loop.
	120	+
	121	+subscriber spin() loop - handle events.
	122	+
	123	+the double-colon operator: (1) namespace (2) static member of class
	124	+
	125	+pointers are memory addresses
	126	+
	127	+arrow -> operator
	128	+
	129	+array are elements in sequence in memory.
	130	+
	131	+char ~*~* = pointer of pointer of char data.
	132	+
	133	+
	134	+