Added intro to numpy

contrib/numpy/Introduction.md

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+# Introduction
+
+## What is Numpy?
+
+NumPy is a general-purpose array-processing package. It provides a high-performance multidimensional array object and tools for working with these arrays. It is the fundamental package for scientific computing with Python. It is open-source software.
+
+## Features of NumPy
+
+NumPy has various features including these important ones:
+
+1. A powerful N-dimensional array object
+2. Sophisticated (broadcasting) functions
+3. Tools for integrating C/C++ and Fortran code
+4. Useful linear algebra, Fourier transform, and random number capabilities
+
+## Install Numpy
+
+Before installing Numpy, ensure you have Python installed on your system. You can download and install Python from the [official Python website](https://www.python.org/).
+
+Numpy can be installed via the following pip command:
+
+```bash
+pip install numpy
+
+```
+
+# How to import NumPy
+
+To access NumPy and its functions import it in your Python code like this:
+
+```bash
+import numpy as np
+
+```
+
+We shorten the imported name to np for better readability of code using NumPy. This is a widely adopted convention that makes your code more readable for everyone working on it. We recommend to always use import numpy as np.

contrib/numpy/index.md

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 # List of sections
 
-- [Section title](filename.md)
+- [Introduction](Introduction.md)