Add README.md

Author: terasakisatoshi

README.md

@@ -1 +1,100 @@
 # TerminalSystemMonitor.jl
+
+## Description
+
+This Julia package displays CPU and RAM memory usage information on your computer.
+
+## Installation
+
+### Step 1. Install Julia
+
+#### macOS or Linux
+
+```sh
+$ curl -fsSL https://install.julialang.org | sh
+```
+
+####
+
+```powershell
+PS> winget install julia -s msstore
+```
+
+You can run `julia --version` to confirm Julia is installed on your computer.
+
+
+### Step 2. Download source code
+
+```sh
+$ git clone https://github.com/AtelierArith/TerminalSystemMonitor.jl.git
+$ cd TerminalSystemMonitor.jl
+```
+
+### Step 3. Resolve dependencies
+
+```
+$ pwd
+path/to/TerminalSystemMonitor.jl
+$ ls
+Project.toml  README.md     main.jl       src
+$ julia -q
+julia> using Pkg; Pkg.activate("."); Pkg.instantiate()
+```
+
+## Usage
+
+```sh
+$ ls
+Project.toml  README.md     main.jl       src
+$ julia main.jl
+```
+
+You will get the following output like this:
+
+```
+──────────────────────╮╭──────────────────────╮
+│     ┌               ┐││     ┌               ┐│
+│id: 0┤■■■■ 37         ││id: 4┤■■ 23.2         │
+│id: 1┤ 0              ││id: 5┤ 0              │
+│id: 2┤■■■ 29          ││id: 6┤■ 15.2          │
+│id: 3┤ 0              ││id: 7┤ 1              │
+│     └               ┘││     └               ┘│
+╰──────────────────────╯╰──────────────────────╯
+╭───────────────────────╮╭───────────────────────╮
+│      ┌               ┐││      ┌               ┐│
+│ id: 8┤■ 10.9          ││id: 12┤ 3              │
+│ id: 9┤ 0              ││id: 13┤ 0              │
+│id: 10┤■ 5.9           ││id: 14┤ 2              │
+│id: 11┤ 0              ││id: 15┤ 0              │
+│      └               ┘││      └               ┘│
+╰───────────────────────╯╰───────────────────────╯
+╭──────────────────────╮
+│     ┌               ┐│
+│Mem: ┤■■■■■■■■ 29.4   │
+│     └               ┘│
+╰──────────────────────╯
+```
+
+Ofcourse, you can launch the functionality in your terminal.
+
+```julia
+julia> using TerminalSystemMonitor: main; main()
+```
+
+## Why not htop?
+
+You might think of the `htop' command. Yes, you can:
+
+```julia
+julia> using Htop_jll; run(Htop_jll.htop())
+```
+
+However, [Htop_jll](https://github.com/JuliaBinaryWrappers/Htop_jll.jl?tab=readme-ov-file#platforms) only supports Unix systems. Our Julia package runs on Windows as long as Term.jl and UnicodePlots.jl support Windows.
+
+## Why not bottom?
+
+It's possible. We could use [bottom](https://github.com/ClementTsang/bottom) a.k.a `btm` command.
+
+```sh
+btm -b
+```