docs: update README.md with install and config details

README.md

@@ -1,3 +1,55 @@
 # Onx
 
 An agent-friendly CLI (built in Rust btw) for the Onspring API.
+
+## Installation
+
+### Linux & macOS
+
+Install via shell script:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/StevanFreeborn/onx/main/scripts/install.sh | bash
+```
+
+To install a specific version or customize the install directory:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/StevanFreeborn/onx/main/scripts/install.sh | bash -s -- --version v0.1.0 --to ~/.local/bin
+```
+
+### Windows
+
+Install via PowerShell:
+
+```powershell
+irm https://raw.githubusercontent.com/StevanFreeborn/onx/main/scripts/install.ps1 | iex
+```
+
+To install a specific version or customize the install directory:
+
+```powershell
+& ([scriptblock]::Create((irm https://raw.githubusercontent.com/StevanFreeborn/onx/main/scripts/install.ps1))) -Version v0.1.0 -InstallDir "$HOME\.onx\bin"
+```
+
+## Configuration
+
+`onx` can be configured using command-line arguments, a JSON configuration file, or environment variables.
+
+### Precedence
+
+1. **Command-line flags** (`--api-key`, `--base-url`, `--pretty`)
+2. **Configuration file** (`~/.config/onx/config.json` or `--config <PATH>`)
+3. **Environment variables** (`ONSPRING_API_KEY`, `ONSPRING_BASE_URL`)
+
+### Configuration File Format
+
+Create `~/.config/onx/config.json`:
+
+```json
+{
+  "apiKey": "your-api-key",
+  "baseUrl": "https://api.onspring.com",
+  "pretty": true
+}
+```