chore: updated Dataset card.

README.md

@@ -67,3 +67,15 @@ The raw EMG data is a header-less CSV file with the columns containing 8 success
 [3]:  [8 readings][8 readings][8 readings][8 readings][8 readings]
 ...
 ```
+Each row can be treated as a single 5-dimensional data unit in time.
+
+## FFT EMG Data
+The FFT EMG data is a header-less CSV file with the columns containing 4 FFT bins with ~143 Hz resolution from the corresponding sensor:
+```
+      [sensor 1] [sensor 2] [sensor 3] [sensor 4] [sensor 5]
+[0]:  [4 bins]   [4 bins]   [4 bins]   [4 bins]   [4 bins]
+[1]:  [4 bins]   [4 bins]   [4 bins]   [4 bins]   [4 bins]
+[2]:  [4 bins]   [4 bins]   [4 bins]   [4 bins]   [4 bins]
+[3]:  [4 bins]   [4 bins]   [4 bins]   [4 bins]   [4 bins]
+...
+```