added profiles and readmes

misc/readmes/readme_car_subset.txt

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+BRouter - Beta Version 0.9.5 - Using the car-subset datafiles
+==========================================================
+
+Starting with version 0.9.5, BRouter supports car-subset
+datafiles as a workaround for the memory issue in car routing.
+
+Car-routing, however, is still considered experimental,
+mainly due to the fact that turn-restrictions are still
+not handled. 
+
+The cause of the memory overflow in long-distance car-routing
+is the fact that a large fraction of the ways is not allowed
+for cars and that the node-cache-pipe of brouter is not designed
+to handle that. So the car-subset datafiles (".cd5") are identical
+to the full datafiles (".rd5"), but do not contain the nodes
+and ways that are not accessible for cars.
+
+Using the car-subset datafiles, car-routing over longer
+distances is possible, and it it somewhat faster than using
+the full datafiles.
+
+The car subset datafiles must be stored in a subdirectory
+"carsubset" of the "segments2" directory, so a possible
+file-system structure looks like this:
+
+  brouter/segments2/E5_N45.rd5
+  brouter/segments2/carsubset/E5_N45.cd5
+
+You can download the cd5's from the corresponding URL
+just like the rd5's.
+
+Access to the car-subset datafiles is enabled
+by assigning the routing-profile variable:
+
+  assign   validForCars        1
+
+as it is done for the "car-test" profile. In that case,
+the router first checks for the car-subset file, and,
+if it does not exist, uses the full datafile. It is
+o.k. to just install the car-subset file without
+having the full datafile installed.
+
+If you want to use the car-subset datafile for bike-routing
+(because you don't have the full datafile or because you
+are using streets only anyhow and want better performance),
+just assign the "validForCars" variable in your biking
+profile as indicated above.