restore README.txt that got lost when I moved the python directory

swig/python/README.txt

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+** General info on the swig-generated wrappers for Comedilib **
+
+1) Regenerating the wrappers
+	The wrapper were made using swig-1.3.19. Any of the swig-1.3.x seris should work
+	N.B. the default swig on redhat systems is version 1.1. Upgrade to v-1.3.19. It's better!
+	
+	run $> swig -python comedi.i
+	
+2) Building the module
+	i) edit the setup.py file so that the include and lib paths are correct for your system
+	ii) run $>	python setup.py build
+	
+3) Installing the module
+	i) Manual installation I'm afraid. Copy comedi.py and _comedi.pyd files to somewhere in your PYTHONPATH
+	
+4) Using the module
+	All the comedilib functions are translated directly to python function. The various comedi structs
+	are now available as python classes (e.g. comedi_cmd_struct). The members of each struct are now
+	attributes of the class and can be set and retrieved in the usual way. Comedilib Functions which 
+	take a pointer to a comedilib struct as an argument (in C) now, in python, accept the appropriate 
+	struct python object.
+	
+	For a multichannel acquisition, a C-array containing the channel list, gains and referencing is
+	required. This can be created using a swig-generated helper class: chanlist(n). This creates a C-array
+	of length n and type Unsigned Int. Individual members of the array can be accessed/set using 
+	pythons indexing syntax:
+		mylist = chanlist(3)   #creates a chanlist array of length 3
+		mylist[0] = 100 #set some values
+		mylist[1] = 200
+		mylist[2] = 300
+		
+	The chanlist object can then be passed to a comedi_cmd_struct object, for example. N.B. The
+	chanlist object contains *no* length-checking or other error protection so use with care! Don't
+	try to get/set indexes outside the array bounds.
+	
+	All the comedilib macros (e.g. CR_PACK) are now available as python functions.
+	
+	check out the example test_comedi.py to clarify the above.
+	
+