Add Run Length Encoding and Decoding [#2719]

[jeetshah-410]

This PR adds the implementation of Run Length Encoding and Decoding as part of the string compression algorithms.

Features:
encode() function: Compresses a string by converting consecutive repeated characters into a single character followed by the count.

decode() function: Expands the encoded string back to its original form.

File path:
strings/run_length_encoding.cpp

Example:
Input: "aaabbcdddd"

Encoded: "a3b2c1d4"

Decoded: "aaabbcdddd"

This implementation is simple, clear, and includes a main() function to demonstrate the functionality.

[realstealthninja]

Please follow contribution guidelines before opening a pull request. Also make sure to follow the pull request format, This pull request does not comply. The guidelines can be found in the repository named the same.

[realstealthninja]

Suggested change

using namespace std;