update readme

Author: Dan Butvinik

README.md

@@ -1 +1,30 @@
 # @clearlydefined/spdx
+
+ClearlyDefined focused SPDX utility library.
+
+## Install
+
+```
+npm install @clearlydefined/spdx
+```
+
+```js
+const SPDX = require('@clearlydefined/spdx')
+
+SPDX.parse('MIT')
+SPDX.stringify({ license: 'MIT' })
+SPDX.satisfies('MIT', 'MIT OR Apache-2.0')
+SPDX.merge('MIT', 'Apache-2.0', 'AND')
+SPDX.expand('MIT or Apache-2.0')
+SPDX.normalize('mit')
+SPDX.lookupByName('Apache License 2.0')
+```
+
+## Local development
+
+```
+git clone https://github.com/clearlydefined/spdx
+cd spdx
+npm i
+npm test
+```

package.json

@@ -7,6 +7,14 @@
     "type": "git",
     "url": "git+https://github.com/clearlydefined/spdx.git"
   },
+  "main": "index.js",
+  "keywords": [
+    "spdx"
+  ],
+  "bugs": {
+    "url": "https://github.com/clearlydefined/spdx/issues"
+  },
+  "homepage": "https://github.com/clearlydefined/spdx",
   "scripts": {
     "test": "nyc mocha \"test.js\" && eslint ."
   },