added bit manipulation snippets

Author: Mcbencrafter

snippets/java/bit-manipulation/bit-counting.md

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+---
+title: Bit Counting
+description: Counts the bits in an integer
+author: Mcbencrafter
+tags: math,number,bits,bit-counting
+---
+
+```java
+public static int countBits(int number) {
+    int bits = 0;
+        
+    while (number > 0) {
+        bits += number & 1;
+        number >>= 1;
+    }
+
+    return bits;
+}
+
+// Usage:
+int number = 5;
+System.out.println(countBits(5)); // 2 (101)
+```

snippets/java/bit-manipulation/is-power-of-two.md

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+---
+title: Is Power Of Two
+description: Checks if a number is a power of two
+author: Mcbencrafter
+tags: math,number,bit,power-of-two
+---
+
+```java
+public static boolean isPowerOfTwo(int number) {
+    return (number > 0) && ((number & (number - 1)) == 0);
+}
+
+// Usage:
+int number = 16;
+System.out.println(isPowerOfTwo(5)); // true (2^4)
+```