Create numpy.md

Author: zaid-kamil

Diff for: numpy.md

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+### Numpy
+1. Write a NumPy program to create an array of 10 zeros.
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+2. Write a NumPy program to create an array of 10 ones.
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+3. Write a NumPy program to create a 3x3 matrix with values ranging from 0 to 8.
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+4. Write a NumPy program to reverse an array (first element becomes the last).
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+5. Write a NumPy program to extract all odd numbers from an array.
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+6. Write a NumPy program to compute the sum of all elements, mean, and standard deviation of a given array.
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+7. Write a NumPy program to create a 5x5 matrix with random values and find the minimum and maximum values.
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+8. Write a NumPy program to create a 2D array with 1 on the border and 0 inside.
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+9. Write a NumPy program to multiply two given matrices.
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+10. Write a NumPy program to find the unique elements of an array.
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+11. Write a NumPy program to extract the elements in the odd-numbered columns of a 2D array.
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+12. Write a NumPy program to extract the elements in the even-numbered rows of a 2D array.
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+13. Write a NumPy program to extract a subarray from a given array. The subarray should include the first 3 rows and the columns from index 1 to 4 (inclusive).
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+14. Write a NumPy program to reverse the order of elements in each column of a 2D array.
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+15. Write a NumPy program to create a diagonal matrix from a given 1D array. The elements below the diagonal should be zero, and the elements above the diagonal should be squared.