add: requirements

README.md

@@ -11,6 +11,14 @@ Data:
 -  opens the file like 10 times
 - latest hour is hardcoded to 18
 
+# Requirements
+Requires `eccodes` to be installed
+https://confluence.ecmwf.int/display/ECC/ecCodes+Home
+```
+pip install -r requirements.txt
+python -m eccodes selfcheck 
+```
+
 
 # Usage
 ```