README added

README.md

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+# Huffman archiver
+
+An archiver that uses Huffman code for compression
+
+## Building from source
+
+#### Prerequisite Tools
+
+* [Git](https://git-scm.com/download)
+* [Go (version 1.17 or later)](https://go.dev/dl)
+
+1. Install all prerequisite tools
+2. Clone this repository
+
+```bash
+git clone https://ashley.sch9.ru/git/mrfoxygmfr/huffman-archiver
+```
+
+3. Build executable binary
+
+```bash
+go build -o huffman main.go
+```
+
+## Usage
+
+#### Archiving
+
+To archive a file, use the command
+
+```bash
+./huffman encode <archive name> <file name>
+```
+
+where `<file name>` is the name of the file to be compressed, `<archive name>` is the name of the archive to be created.
+
+#### Unpacking
+
+To unpack a file, use the command
+
+```bash
+./huffman decode <archive name> <file name>
+```
+
+where `<archive name>` is the name of the archive to unpack, `<file name>` is the name of the file to save.