Update README

Author: flovilmart

README.md

@@ -0,0 +1,98 @@
+# parse-server-s3-adapter
+parse-server adapter for AWS S3
+
+# installation
+
+`npm install --save parse-server-s3-adapter`
+
+# usage with parse-server
+
+### using a config file
+
+```
+{
+  "appId": 'my_app_id',
+  "masterKey": 'my_master_key',
+  // other options
+  "filesAdapter": {
+    "module": "parse-server-s3-adapter",
+    "options": {
+      "accessKey": "accessKey",
+      "secretKey": "secretKey",
+      "bucket": "my_bucket",
+      // optional:
+      "region": 'US_EAST_2', // default value
+      "bucketPrefix": '', // default value
+      "directAccess": false // default value
+    } 
+  }
+}
+```
+
+### using environment variables
+
+Set your environment variables:
+
+```
+S3_ACCESS_KEY=accessKey
+S3_SECRET_KEY=secretKey
+S3_BUCKET=bucketName
+```
+
+And update your config / options
+
+```
+{
+  "appId": 'my_app_id',
+  "masterKey": 'my_master_key',
+  // other options
+  "filesAdapter": "parse-server-s3-adapter"
+}
+```
+
+
+### passing as an instance
+
+```
+var S3Adapter = require('parse-server-s3-adapter');
+
+var s3Adapter = new S3Adapter('accessKey', 
+								'secretKey', 
+								'bucket' , {
+								    region: 'US_EAST_2'
+									bucketPrefix: '',
+									directAccess: false
+								});
+
+var api = new ParseServer({
+	appId: 'my_app',
+	masterKey: 'master_key',
+	filesAdapter: s3adapter
+})
+```
+
+or with an options hash
+
+```
+var S3Adapter = require('parse-server-s3-adapter');
+
+var s3Options = {
+	"accessKey": "accessKey",
+   	"secretKey": "secretKey",
+   	"bucket": "my_bucket",
+   	// optional:
+   	"region": 'US_EAST_2', // default value
+   	"bucketPrefix": '', // default value
+   	"directAccess": false // default value
+} 
+
+var s3Adapter = new S3Adapter(s3Options);
+
+var api = new ParseServer({
+	appId: 'my_app',
+	masterKey: 'master_key',
+	filesAdapter: s3Adapter
+})
+```
+
+