Create README.md

Author: mark-onyschuk

README.md

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+# Geometry
+A repository of common geometric algorithms and `CoreGraphics` type extensions.
+
+## Algorithms
+At present, the package contains no algorithms.
+
+## `CoreGraphics` Extensions
+Geometry defines `CGVectorType` a protocol unifying the various 2D CoreGraphics
+types including `CGPoint`, `CGSize`, and `CGVector`. The type provides support for
+easy conversion among types.
+
+The type also allows for a concise definition of standard operators for addition, 
+subtraction, multiplication, and division involving `CGVectorType` types.
+
+Finally, the package includes several extensions to `CGRect`.