docs(challenge-01): add documentation

challenge-01/README.md

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+# Unix WC tool using Go
+
+A WC tool named `ccwc` built from scratch using Go.  
+Analyzes input streams and provides counts for:
+
+- Bytes
+- Lines
+- Words
+- Runes
+
+## Documentation
+
+- [**Overview**](#overview)
+- [**Project Structure**](#project-structure)
+- [**Example**](#example)
+- [**Setup**](#setup)
+- [**Build Process**](#build-process)
+- [**License**](#license)
+
+
+## Overview
+
+This project is a custom implementation of the Unix `wc` utility built from scratch. The goal is to understand how file analysis and stream processing work at a low level.
+
+The tool works in two stages:
+
+#### Reader
+
+Detects the input mode and provides a stream to the Analyzer.
+
+- `Terminal mode`: reads from a file path provided as a cli argument
+- `Stdin mode`: reads from piped standard input
+
+#### Analyzer
+
+Reads the input stream in 32kB chunks and computes results for each selected option.
+
+- `-c`: counts total bytes in the stream
+- `-l`: counts newline characters
+- `-w`: counts whitespace-delimited tokens
+- `-m`: counts Unicode code points using UTF-8 decoding
+
+
+## Project structure
+
+```
+folder: challenge-01/
+├── cmd/
+|   └── ccwc.go          # entry point
+│
+├── config/
+│   └── config.go        # defines central configuration
+│
+├── analyzer/
+│   ├── reader.go        # handles reading of input 
+│   ├── analyzer.go      # analyzes required options
+│   └── errors.go        # predefined errors
+|
+├── test.txt             # test file 
+|
+├── diagrams/            # [WIP]
+|
+├── file_test.go         # [WIP]
+
+```
+
+## Example
+
+Input:
+
+```bash
+ccwc -w -l test.txt
+```
+
+Output:
+
+```bash
+map[Lines:7145 Words:58164]
+```
+
+## Setup
+
+### Prerequisites
+
+- [Go](https://go.dev/doc/install) 1.23 or later
+
+- follow the steps [here](https://github.com/priyanshsao/coding-challenges-go/blob/main/README.md#setup) to setup parent repository.
+
+### Change Directory
+
+```bash
+cd challenge-01/
+```
+
+### Run program
+
+```bash
+go run ./cmd/ccwc.go
+```
+
+### Build binary
+
+```bash
+go build -o ./bin/ccwc ./cmd/ccwc.go
+```
+
+### Run unit tests
+
+```bash
+go test -v
+```
+
+### Get test coverage profile
+
+```bash
+go test ./ -coverprofile=coverage.out
+go tool cover -html=coverage.out -o coverage.html
+start coverage.html
+```
+
+> [!TIP]
+> Clean up coverage files using this
+> `rm coverage.out coverage.html`
+
+## Build Process
+- Each and every feature and bugs are tracked using github issues.
+
+- Main steps for building this project are tracked in [epic issue](https://github.com/priyanshsao/coding-challenges-go/issues/10).
+
+## License
+
+Licensed under [MIT](https://github.com/priyanshsao/coding-challenges-go/blob/main/LICENSE).