readme added

Author: Sidd-77

README.md

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+# Custom Shell
+
+## Overview
+This is a simple custom shell written in C++ from scratch. It supports various shell-like features including command execution, piping, background processes, and I/O redirection.
+
+## Features
+- **Execute Commands**: Run standard system commands.
+- **Change Directory (`cd`)**: Navigate between directories.
+- **Help Command (`help`)**: Display available commands.
+- **Background Execution (`&`)**: Run processes in the background.
+- **Check Background Processes (`checkbg`)**: View running background jobs.
+- **Piping (`|`)**: Connect commands using pipes.
+- **I/O Redirection (`>` and `>>`)**: Redirect command output to files.
+
+## Installation & Compilation
+### Prerequisites
+- C++ Compiler (G++ recommended)
+- Make (for compilation automation)
+
+### Build Instructions
+To compile the shell, use the provided **Makefile**:
+```sh
+make
+```
+This generates the executable `shell`.
+
+### Running the Shell
+After compilation, run the shell with:
+```sh
+./shell
+```
+
+### Cleaning Up
+To remove compiled files, run:
+```sh
+make clean
+```
+
+## Usage
+### Running Commands
+You can run any system command just like in a normal shell:
+```sh
+ls
+pwd
+echo "Hello, World!"
+```
+
+### Changing Directories
+```sh
+cd <directory>
+```
+Example:
+```sh
+cd /home/user
+```
+
+### Background Execution
+Run a command in the background by appending `&`:
+```sh
+top &
+```
+Use `checkbg` to view background processes:
+```sh
+checkbg
+```
+
+### Piping Commands
+Use `|` to pass the output of one command as input to another:
+```sh
+ls | grep .cpp
+```
+
+### I/O Redirection
+- Overwrite file output:
+  ```sh
+  echo "Hello" > file.txt
+  ```
+- Append to a file:
+  ```sh
+  echo "Hello Again" >> file.txt
+  ```
+
+### Display Help
+Run:
+```sh
+help
+```
+