update readme

Author: GrantBirki

README.md

@@ -1,2 +1,18 @@
-# tarkov-image-generator
+# tarkov-image-generator ⚙️
+
 Originally written by kokarn, the tarkov image generator generates icons and grid-size images from the tarkov icon cache folder. This fork was made after kokarn made the decision to shutdown Tarkov Tools.
+
+## Usage 🔨
+
+To use this utility, you need to have `node` installed. You can then do the following steps:
+
+1. Clone this repo
+2. Install dependencies - `npm install`
+3. Run the script - `npm start`
+
+The results will be placed in two folders:
+
+- `generated-images/`
+- `generated-images-missing/`
+
+The results will contain `base-image`, `grid-image`, and `icon` files