$5\mathrm{.}2.$ Write a Python program that implements a class call HuffmanCoding, used to encode and decode text. The class must have the following methods: Build$\_$frequency $\_$dict: constructs the frequency dictionary. Build$\_$huffman tree; constructs the Huffman tree. Encoding: used to encode the text, and store bits in a binary file. Decoding: used to decode contents of the binary file into plain text.