adding readme.txt to hydro. also adding unit testing data

git-svn-id: svn://scm.naturalcapitalproject.org/svn/invest-test-data@14 a1e471e8-3ae1-4eeb-aa86-f41caf2650e8

hydropower/README.txt

+Directories:
+- scarcity : holds results that were generated by running the InVEST Hydropower v3.2.0 with Scarcity selected on the installer's sample default data.
+
+- water_yield : holds results that were generated by running the InVEST Hydropower v3.2.0 on the installer's sample default data.
+
+- valuation : holds results that were generated by running the InVEST Hydropower v3.2.0 with Valuation selected on the installer's sample default data.
+
+- smoke : holds very simple sample data created by hand using pygeoprocessing.testing.sampledata.create_raster_on_disk and pygeoprocessing.testing.sampledata.create_vector_on_disk.
+          this data has no numerical importance, but is used as a means to have the model run completely so that the suffix parameter can be tested.
+
+Files:
+- aet.tif : this result was generated by running the InVEST Hydropower v3.2.0 on the installer's sample default data.
+- wyield.tif : this result was generated by running the InVEST Hydropower v3.2.0 on the installer's sample default data.
+- fractp.tif : this result was generated by running the InVEST Hydropower v3.2.0 on the installer's sample default data.
+- two_polygon_shape.* : this shapefile was generated by the script found in this directory called 'create_polygon_shapefile.py'.
+                        the shapefile is used for unit testing some helper functions in Hydropower.
+- create_polygon_shapefile.py : a script used to generate 'two_polygon_shape.shp' for unit testing

hydropower/two_polygon_shape.prj

+PROJCS["NAD83_CSRS_UTM_zone_10N",GEOGCS["GCS_NAD83(CSRS)",DATUM["D_North_American_1983_CSRS98",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-123],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]
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