### IShell - (pseudo)interactive shell
The main goal was to make a shell interface that remembers `cd` commands.
You can create a new shell by simply doing:
```rust
// Parameter here is an Option<String> corresponding to
// the initial directory, from where the command will be ran.
let shell = IShell::new(None);
```
You can also specify where to open the shell initially:
```rust
// No matter from where you run the program,
// the shell will always be created at ~/Desktop
let desktop_shell = IShell::new("~/Desktop");
```
To run a command through your shell, you can do the following:
```rust
shell.run_command("echo 'Hello, World!'");
```
The `run_command` method also returns `std::process::Output` type.
You can also call
```rust
shell.forget_current_directory();
```
To make the shell set current directory to the initial directory specified.
If initial directory wasn't specified, then this sets the current shell directory to
the `$PWD` of the terminal running the program.