PowerShell - leap, raindrops, reverse-string, two-fer

powershell/leap/README.md

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+# Leap
+
+Welcome to Leap on Exercism's PowerShell Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a year, report if it is a leap year.
+
+The tricky thing here is that a leap year in the Gregorian calendar occurs:
+
+```text
+on every year that is evenly divisible by 4
+  except every year that is evenly divisible by 100
+    unless the year is also evenly divisible by 400
+```
+
+For example, 1997 is not a leap year, but 1996 is.  1900 is not a leap
+year, but 2000 is.
+
+## Notes
+
+Though our exercise adopts some very simple rules, there is more to
+learn!
+
+For a delightful, four minute explanation of the whole leap year
+phenomenon, go watch [this youtube video][video].
+
+[video]: http://www.youtube.com/watch?v=xX96xng7sAE
+
+## Source
+
+### Created by
+
+- @spuder
+
+### Contributed to by
+
+- @gyssels
+- @kchenery
+
+### Based on
+
+JavaRanch Cattle Drive, exercise 3 - http://www.javaranch.com/leap.jsp