Add README

README.md

@@ -1,3 +1,89 @@
 # xdi
 
-X11 Desktop Info
+Minimal X11 desktop information utility.
+
+Prints desktop and window information as JSON.
+
+## Install
+
+```bash
+cargo install --git https://git.candifloss.cc/candifloss/xdi.git
+```
+
+## Usage
+
+Print the current state:
+
+```bash
+xdi
+```
+
+Example output:
+
+```json
+{
+  "active_window": {
+    "id": 73400324,
+    "name": "Preview README.md - xdi - Code - OSS",
+    "class": "code-oss"
+  },
+  "workspaces": [
+    {
+      "id": 0,
+      "current": true,
+      "windows": [
+        {
+          "id": 35651587,
+          "name": "~/Projects",
+          "class": "Alacritty"
+        },
+        {
+          "id": 73400324,
+          "name": "Preview README.md - xdi - Code - OSS",
+          "class": "code-oss"
+        },
+        {
+          "id": 90177540,
+          "name": "Rust CLI Apps - Rust X11 Workspace Tool - Chromium",
+          "class": "Chromium-browser"
+        },
+        {
+          "id": 104857698,
+          "name": "JsonPretty - JSON Beautifier and Formatter — Mozilla Firefox",
+          "class": "firefox"
+        }
+      ]
+    },
+    {
+      "id": 1,
+      "current": false,
+      "windows": [
+        {
+          "id": 106954755,
+          "name": "~/P/x/src",
+          "class": "Alacritty"
+        }
+      ]
+    }
+  ]
+}
+```
+
+Follow desktop changes:
+
+```bash
+xdi --follow
+```
+
+Or:
+
+```bash
+xdi -f
+```
+
+In follow mode, `xdi` prints a new JSON object whenever the desktop state changes.
+
+## Requirements
+
+- X11
+- An EWMH compatible window manager