har_trees: Fix missing steps in README

Author: jonnor

examples/har_trees/README.md

@@ -100,7 +100,7 @@ mpremote mip install github:jonnor/micropython-zipfile
 
 Copy example code
 ```
-mpremote cp har_uci_trees.csv har_uci.testdata.npz timebased.py  :
+mpremote cp uci_har.trees.csv uci_har.testdata.npz timebased.py  :
 ```
 
 Run model evaluation on a test set

examples/har_trees/uci_har.meta.json

@@ -0,0 +1 @@
+{"classes": {"LAYING": 0, "SITTING": 1, "STANDING": 2, "WALKING": 3, "WALKING_DOWNSTAIRS": 4, "WALKING_UPSTAIRS": 5}, "window_length": 128}