add 'runServer.py' script in pybullet_utils, this will run a GUI server

that accepts SHARED_MEMORY connections. Handy if you run a pybullet_envs Gym environment
and want to visualize it. By default, bullet_client will try to connect to a shared memory connection first.

examples/pybullet/gym/pybullet_utils/runServer.py

@@ -0,0 +1,18 @@
+#add parent dir to find package. Only needed for source code build, pip install doesn't need it.
+import os
+import inspect
+currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
+parentdir = os.path.dirname(os.path.dirname(currentdir))
+os.sys.path.insert(0, parentdir)
+
+import pybullet_data
+import pybullet as p
+import time
+
+p.connect(p.GUI_SERVER)
+p.setAdditionalSearchPath(pybullet_data.getDataPath())
+
+while (1):
+  #this is a no-op command, to allow GUI updates on Mac OSX (main thread)
+  p.setPhysicsEngineParameter()
+  time.sleep(0.01)