Add README

Author: dcherian

README.md

@@ -1 +1,22 @@
-# cf-xarray
+# cf-xarray
+
+
+A lightweight convenience wrapper for using CF attributes on xarray objects. Right now all of this works:
+
+```
+import cf_xarray
+
+ds = xr.tutorial.load_dataset("air_temperature").isel(time=slice(4))
+
+ds.air.cf.var("X")
+
+ds.air.cf.resample(T="M").var("X")
+
+(
+	ds.air
+	.cf.isel(T=slice(4))
+	.cf.plot.contourf(x="Y", y="X", col="T", col_wrap=4)
+)
+
+ds.air.isel(lat=[0, 1], lon=1).cf.plot.line(x="T", hue="Y")
+```