message: Document FULLY_CONNECTED support in XNNPACK delegate
diff: @@ -83,6 +83,16 @@ Below is the list of current operators and limitations:
  ### `DEPTHWISE_CONV_2D`
  +* Inputs and outputs must be in 32-bit floating-point format.
  +* Bias is mandatory.
  +* Both filter and bias must be static (use `kTfLiteMmapRo` allocation type).
  +* Fused `NONE`, `RELU`, `RELU_N1_TO_1`, and `RELU6` activations are supported,
  + but fused `TANH` and `SIGN_BIT` activations are not.
  +* Dynamically allocated (with `kTfLiteDynamic` allocation type) input and output
  + are not supported.
  +
  +### `FULLY_CONNECTED`
  +
  * Inputs and outputs must be in 32-bit floating-point format.
  * Bias is mandatory.
  * Both filter and bias must be static (use `kTfLiteMmapRo` allocation type).
  