Create saving_numpy_arrays_to_files.md

Added introduction
Added save method

contrib/numpy/saving_numpy_arrays_to_files.md

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+# Saving NumPy Arrays to Files
+
+- Saving arrays in NumPy is important due to its efficiency in storage and speed, maintaining data integrity and precision, and offering convenience and interoperability.
+- NumPy provides several methods to save arrays efficiently, either in binary or text formats.
+- The primary methods are `save`, `savez`, and `savetxt`.
+
+### 1. numpy.save():
+
+The `np.save` function saves a single NumPy array to a binary file with a `.npy` extension. This format is efficient and preserves the array's data type and shape.
+
+#### Syntax :
+
+  ```python
+  numpy.save(file, arr, allow_pickle=True, fix_imports=True)
+  ```
+- **file** : Name of the file.
+- **arr** : Array to be saved.
+- **allow_pickle** : This is an Optional parameter, Allows saving object arrays using Python pickles.(By Default True)
+- **fix_imports** : This is an Optional parameter, Fixes issues for Python 2 to Python 3 compatibility.(By Default True)
+
+#### Example :
+
+```python
+import numpy as np
+
+arr = np.array([1,2,3,4,5])
+np.save("example.npy",arr) #saves arr into example.npy file in binary format
+```
+
+Inorder to load the array from example.npy
+
+```python
+arr1 = np.load("example.npy")
+print(arr1)
+```
+**Output** :
+  
+```python
+[1,2,3,4,5]
+```