Add documentation

README.md

@@ -2,7 +2,13 @@
 
 Fetch a GraphQL schema from a server and write it to file
 
-## Usage
+## Installation
+
+```sh
+npm install graphql-fetch-schema
+```
+
+## CLI Usage
 
 ```sh
 graphql-fetch-schema <url> [options]
@@ -18,6 +24,24 @@ graphql-fetch-schema <url> [options]
 -o, --output <directory>  write to specified directory
 ```
 
+### API usage
+
+```js
+import fetchSchema from 'graphql-fetch-schema'
+
+fetchSchema('https://api.myserver.com/graphql', {
+  json: true,
+  graphql: false,
+  outputPath: '../schema',
+})
+.then(() => {
+  console.log('Schema successfully written')
+})
+.catch((err) => {
+  console.error(err)
+})
+```
+
 ## License
 
 MIT

package.json

@@ -10,7 +10,8 @@
     "clean": "rm -rf ./lib",
     "compile": "babel src --out-dir lib",
     "build": "npm run clean && npm run compile",
-    "start": "npm run compile"
+    "start": "npm run compile",
+    "prepublish": "npm ls && npm start"
   },
   "author": "Paul Le Cam <[email protected]>",
   "license": "MIT",