Created Nim use cases (asciidoc)

Nim-use-cases.asciidoc

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+This is an introductory page on use cases where you might want to use Nim.
+
+### Where Nim works well
+
+
+### Where Nim will work well
+
+System libraries
+
+
+
+### Where Nim might not be the best fit
+
+Scripts and interactive use - 
+
+Beginners::
+  as a first language, Nim is more complex than Python or Ruby