Add bit manipulation section.

src/algorithms/math/bits/README.md

@@ -0,0 +1,37 @@
+# Bit Manipulation
+
+#### Get Bit
+
+This method shifts `1` over by `bitPosition` bits, creating a 
+value that looks like `00100`. Then we perform `AND` operation
+that clears all bits from the original number except the
+`bitPosition` one. Then we compare the result with zero. If 
+result is zero that would mean that original number has `0` at
+position `bitPosition`.
+
+> See `getBit` function for further details.
+
+#### Set Bit
+
+This method shifts `1` over by `bitPosition` bits, creating a
+value that looks like `00100`. Then we perform `OR` operation
+that sets specific bit into `1` but it does not affect on
+other bits of the number.
+
+> See `setBit` function for further details.
+
+#### Clear Bit
+
+This method shifts `1` over by `bitPosition` bits, creating a
+value that looks like `00100`. Than it inverts this mask to get
+the number that looks like `11011`. Then `AND` operation is
+being applied to both the number and the mask. That operation 
+unsets the bit.
+
+> See `clearBit` function for further details.
+
+#### Update Bit
+
+This method is a combination of "Clear Bit" and "Set Bit" methods.
+
+> See `updateBit` function for further details.