add test.py with test, closes HydrologicEngineeringCenter#9 (HydrologicEngineeringCenter#15)

Author: ktarbet

.gitignore

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+__pycache__/**

tests.py

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+from hec_dss import HecDss
+from datetime import datetime
+
+class Tests:
+
+   @staticmethod
+   def test_issue9():
+        dss = HecDss("sample7.dss")
+        pathnames = [
+        "//SACRAMENTO/PRECIP-INC//1Day/OBS/",
+        "/EF RUSSIAN/COYOTE/PRECIP-INC//1Hour/TB/"
+        "/GREEN RIVER/OAKVILLE/ELEVATION//1Hour//"
+        ]
+        t1 = datetime(2006, 3, 1)
+        t2 = datetime(2006, 3 ,30)
+        for path in pathnames:
+            print(f"reading {path}")
+            tsc = dss.get(path,t1,t2)
+            print("len(tsc.values) = {len(tsc.values)}")
+            assert(len(tsc.values)>1)
+
+
+Tests.test_issue9()
+