Update readme

README.md

@@ -2,12 +2,33 @@
 
 ![npm (scoped)](https://img.shields.io/npm/v/@nplayfair/npe_gerber)
 
-Requires node version 10 or higher
+**This is still being developed and isn't ready for production!**
+Only tested with gerbers generated by EAGLE.
 
-Image processing configuration example:
+Requires node version 10 or higher.
+
+## Usage
+
+```
+const fileProc = require('@nplayfair/npe_gerber');
+
+const folderConfig = {
+    tmpDir: path.join(__dirname, 'tmp'),
+    imgDir: path.join(__dirname, 'img')
+}
 
 const config = {
-  resizeWidth: 600,
+    resizeWidth: 600,
-  density: 1000,
+    density: 1000,
-  compLevel: 1,
+    compLevel: 1
 }
+
+fileProc.config(folderConfig);
+
+let gerberArchive = '/path/to/gerber.zip';
+
+fileProc.gerberToImage(gerberArchive, config, folderConfig.tmpDir, folderConfig.imgDir)
+      .then(filename => {
+        console.log(`Generated image ${filename}`);
+      })
+```

package.json

@@ -16,6 +16,11 @@
     "url": "https://github.com/nplayfair/npe_gerber/issues"
   },
   "homepage": "https://github.com/nplayfair/npe_gerber#readme",
+  "keywords": [
+    "pcb",
+    "image",
+    "gerber"
+  ],
   "dependencies": {
     "fs-extra": "^9.1.0",
     "jszip": "^3.5.0",