Added examples

examples/4_cstat.py

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+from nuwavdet import nuwavdet as nw
+import numpy as np
+
+
+OBS_PATH = r'.//path_to_obs//nu<obsid><DET>01_cl.evt'
+MASK_PATH = r'.//path_to_mask//<obsid><DET>.fits'
+
+
+if __name__ == '__main__':
+    # CREATE THE OBSERVATION CLASS OBJECT
+    obs = nw.Observation(OBS_PATH)
+
+    # READ THE REGION MASK FILE
+    region = nw.fits.getdata(MASK_PATH)
+
+    # TRANSFORM REGION MASK DATA TO NUMPY MASK DATA (SEE 1_save_results.py).
+    region = np.logical_not(region.astype(bool))
+
+    # CREATE MASKED ARRAY CLASS OBJECT
+    masked_data = np.ma.masked_array(obs, mask=region)
+
+    # CALCULATE THE CSTAT ON THE MASKED DATA
+    print(nw.сstat(masked_data.mean(), masked_data))