Add Sea Ice Extent Geojson Files

geometric_data/seaice/region/August_Historical_Median_Sea_Ice_Extent/region.geojson

@@ -0,0 +1,17 @@
+{
+    "type": "FeatureCollection",
+    "features": [
+        { 
+	    "type": "Feature", 
+            "properties": {
+                "name": "August Median Sea Ice Extent (1981-2010)",
+                "tags": "QGreenland;Historical_Sea_Ice_Extent",
+                "object": "region",
+                "component": "sea ice",
+                "author": "Modified by Alex Hager from https://github.com/nsidc/qgreenland/"
+	    },
+	    "geometry": {
+  	        "type": "Polygon",
+                "coordinates": [
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