Added examples

examples/3_wavelet.py

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+from nuwavdet import nuwavdet as nw
+
+OBS_PATH = r'.//path_to_obs//nu<obsid><DET>01_cl.evt'
+THRESH = (3, 2)
+
+
+if __name__ == '__main__':
+    # CREATE THE OBSERVATION CLASS OBJECT
+    obs = nw.Observation(OBS_PATH)
+
+    # CALCULATE THE WAVLET LAYERS WITH GIVEN THRESHOLD
+    wav_layers = obs.wavdecomp(mode='atrous', occ_coeff=True, thresh=THRESH)
+
+    # ALL THE LAYERS CAN BE ACCESSED AS AN ELEMENT OF wav_layers VARIABLE
+    # wav_layers[0] for the 1st wavelet layer
+    # wav_layers[4] for 5th wavelet layer
+    # wav_layers[-1] for the last wavelet layer
+    # wav_layers[2:5] for the list of the layers from 3 to 5
+    # wav_layers[[1, 3, 5]] for the list of layers 2, 4 and 6
+
+    # To calculate the sum of wavelet layers one should use sum() method
+    # wav_layers[2:7].sum(0) returns a sum of layers from 3 to 7
+    # wav_layers[[1, 3, 5]].sum(0) returns a sum of layers 2, 4 and 6.