Create README.md

Author: joelvbernier

README.md

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+# HEXRD Example Problems
+Repository of test and tutorial problems for hexrd.  Some of these results are used in the CI for `hexrd`
+
+## NIST Ruby (SRM 1990a)
+Two cases:
+1. single ruby with single GE 41RT amorphous Si flat panel detector; and
+2. multi-ruby sample (3 spheres) with dual Dexela 2932 detectors
+
+*_TODO: figures and text coming_*
+
+## Diamond Anvil Cell Examples
+Currently a multi-wedge, axial diffraction scan of alpha-Zirconium in supercritical Neon.
+Specifications:
+- ω ranges (start, stop, steps):
+  1. (-115°, -65°, 50)
+  2.  (65°, 115°, 50)
+- Pressure ~0.4GPa