added a few CSG examples

tutorials/detector/CSG/README.md

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+This folder contains demos of all CSG solids that can be handled by Geant4 text geometry description. A shape, sphere for example, is defined in [sphere.tg](sphere.tg). To visualize it, please run
+
+```sh
+G4VIS_DEFAULT_DRIVER=HepRepFile gears sphere.mac
+```
+
+The environment variable `G4VIS_DEFAULT_DRIVER` can be used to select a visualization driver other than the default one.

tutorials/detector/CSG/hype.mac

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+/geometry/source hype.tg
+
+/control/execute vis.mac
+
+/control/shell if [ -f G4Data0.heprep ]; then mv G4Data0.heprep hype.heprep; fi
+/control/shell if [ -f g4_00.wrl ]; then mv g4_00.wrl hype.wrl; fi

tutorials/detector/CSG/hype.tg

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+:volu hall BOX 50 50 50 G4_Galactic
+:vis hall OFF
+
+:rotm r000 0 0 0
+
+// Inner radius , Outer radius , Inner stereo angle , outer stereo angle , Half length in Z
+:volu  hype HYPE 10 12 25 35 9 G4_AIR
+:color hype 0.4 0.3 0.8
+:place hype 1 hall r000 0 0 0

tutorials/detector/CSG/sphere.mac

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+/geometry/source sphere.tg
+
+/control/execute vis.mac
+
+/control/shell if [ -f G4Data0.heprep ]; then mv G4Data0.heprep sphere.heprep; fi
+/control/shell if [ -f g4_00.wrl ]; then mv g4_00.wrl sphere.wrl; fi

tutorials/detector/CSG/sphere.tg

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+:volu hall BOX 50 50 50 G4_Galactic
+:vis hall OFF
+
+:rotm r000 0 0 0
+
+// inner, outer radius, starting, delta phi, starting, delta theta of the segment
+:volu sphere SPHERE 20 40 30 60 45 60 G4_AIR
+:color sphere 0.9 0 0
+:place sphere 1 hall r000 0 0 0

tutorials/detector/CSG/vis.mac

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+/run/initialize
+
+/geometry/test/run
+
+/vis/open
+/vis/drawVolume
+
+/vis/scene/add/axes 0 0 0 50 mm auto false
+/vis/viewer/set/background white
+/vis/viewer/set/viewpointThetaPhi 60 120
+/vis/viewer/flush