Update documentation

README.md

 # p-geolocation
-Promise based Geolocation Code Snippet
+
+Promise based Geolocation. This module uses native [Geolocation API](https://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API)
+
+# Security Info
+
+> This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
+
+> > The Geolocation API allows the user to provide their location to web applications if they so desire. For privacy reasons, the user is asked for permission to report location information.
+
+# Example Usage
+
+```js
+import geoLocation from "./path/to/geo-location";
+
+geoLocation({
+  type: "currentPosition",
+  position: {
+    enableHighAccuracy: true,
+    maximumAge: 30000,
+    timeout: 27000
+  }
+})
+.then(loc => {
+  console.log(loc);
+})
+.catch(err => {
+  console.log(err);
+});
+
+```
+
+# API
+
+### geoLocation(object)
+
+The `object` will be like this;
+
+```js
+type: "currentPosition", // or watchPosition
+position: {
+  enableHighAccuracy: true,
+  maximumAge: 30000,
+  timeout: 27000
+}
+```
+
+The second argument which called `position` is optional.
+
+### Types
+
+`currentPosition | watchPosition`
+
+If you're setting the `watchPosition` you can see or clear positionID. For example;
+
+```js
+geolocation({
+	type: 'watchPosition',
+	position: {
+		enableHighAccuracy: true,
+		maximumAge: 30000,
+		timeout: 27000
+	}
+})
+.then(loc => {
+  console.log(loc.positionID) // 1
+  loc.clear() // cleared
+  console.log(loc.positionID) // 0
+})
+.catch(err => {
+  console.log(err)
+})
+```
+
+I hope this is what you need.