Update README.md

Author: Alexander-Barth

README.md

@@ -11,11 +11,12 @@
 
 Feature of CFTime include:
 
+* Time instances as defined [Climate and Forecasting (CF) conventions](https://cfconventions.org/)
 * Supporting a wide range of the time resolutions, from days down to attoseconds (for feature parity with NumPy's date time type)
 * Supporting arbitrary time origins
 * Per default, the time counter is a 64-bit integer, but other integers types (such as `Int32`, `Int128` or `BigInt`) or floating-point types can be used (not recommended)
 * Basic arithmetic such as computing the duration between two time instances
-* Conversion function between types and Julia's `DateTime`.
+* Conversion function between CFTime types and Julia's `DateTime`.
 * Time ranges