Create Usage.md

docs/Usage.md

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+# User Guide
+
+## Quickstart
+
+To use statsy, install from PyPi:
+
+```
+pip install statsy
+```
+
+From there, in your own `Scripy.py` file, import statsy and use normally:
+
+```
+from statsy import *
+
+summation( i = 1 , range = 4 , lamda x: x+1 , [[1,2,3,4,5,6,7,8,9]])
+```
+
+Alternatively, you may import it under an alias:
+
+```
+import statsy as sty
+
+sty.summation( i = 1 , range = 4 , lamda x: x+1 , [[1,2,3,4,5,6,7,8,9]])
+```
+
+For a proper guide on usage, stay tuned.