rbug: Update and add READMEs

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+                              RBUG PIPE DRIVER
+
+
+= About =
+
+This directory contains a Gallium3D remote debugger pipe driver.
+It provides remote debugging functionality.
+
+
+= Build Instructions =
+
+To build, invoke scons on the top dir as
+ 
+ scons dri=no statetrackers=mesa winsys=xlib
+
+
+= Usage =
+
+To use do
+
+   export LD_LIBRARY_PATH=$PWD/build/linux-x86-debug/lib
+
+ensure the right libGL.so is being picked by doing
+
+   ldd progs/trivial/tri 
+
+   export XMESA_TRACE=y
+   GALLIUM_RBUG=true progs/trivial/tri
+
+which should open gallium remote debugging session. While the program is running
+you can launch the small remote debugging application from progs/rbug. More
+information is in that directory. Also for a gui see:
+
+   http://cgit.freedesktop.org/mesa/rbug-gui
+
+
+= Integrating =
+
+You can integrate the rbug pipe driver either inside the state tracker or the 
+target. The procedure on both cases is the same. Let's assume you have a 
+pipe_screen obtained by the usual means (variable and function names are just
+for illustration purposes):
+
+  real_screen = real_screen_create(...);
+
+The rbug screen is then created by doing
+
+  rbug_screen = rbug_screen_create(real_screen);
+
+You can then simply use rbug_screen instead of real_screen.
+
+You can create as many contexts you wish from rbug_screen::context_create they
+are automatically wrapped by rbug_screen.
+
+
+--
+Jose Fonseca <[email protected]>
+Jakob Bornecrantz <[email protected]>