message: added an example for tf.image.rot90
diff: @@ -488,6 +488,17 @@ def _flip(image, flip_index, scope_name):
  def rot90(image, k=1, name=None):
  """Rotate image(s) counter-clockwise by 90 degrees.
  +
  + For example:
  + ```python
  + import matplotlib.pyplot as plt
  + img=plt.imread('https://www.tensorflow.org/images/tf_logo_transp.png')
  + tf_img=tf.convert_to_tensor(img) #converting numpy to tensor
  + # rotating `tf_img` counter clockwise by 90 degrees
  + rot_img=tf.image.rot90(tf_img,k=1) #rotated image
  + # fig=plt.plot(), plt.imshow(tf_img) # plots original image
  + # fig=plt.plot(), plt.imshow(rot_img) # plots rotated image
  + ```
  Args:
  image: 4-D Tensor of shape `[batch, height, width, channels]` or 3-D Tensor
  of shape `[height, width, channels]`.
  