Add Java Solution for Problem 191

[mamadaliev]

Hello, Doocs!
Please merge my changes if you think these changes are correct.

1. Add Solution.java file to the 0191. Number of 1 Bits directory.

// Solution.java
public class Solution {
    public int hammingWeight(int n) {
        return Integer.bitCount(n);
    }
}

2. Update README.md.

...
├── 0191.Number of 1 Bits
│   ├── Solution.java
│   ├── Solution.js
│   └── Solution.py
...

Please do not mark this as spam.

[yanglbme]

Hi @egnaf , thanks for your contribution.