Update README.md

README.md

@@ -6,3 +6,67 @@
 [![npm version](https://badge.fury.io/js/geostyler-sld-parser.svg)](https://www.npmjs.com/package/geostyler-sld-parser)
 
 [GeoStyler](https://github.com/terrestris/geostyler/) Style Parser implementation for Styled Layer Descriptor (SLD)
+
+### Issues
+Please provide related issues here https://github.com/terrestris/geostyler/issues
+
+### How to use
+
+ES6:
+```js
+import SLDParser from "geostyler-sld-parser";
+
+const pointSimplePoint = {
+  name: "My Style",
+  rules: [
+    {
+      name: "My Rule",
+      symbolizers: [
+        {
+          kind: "Mark",
+          wellKnownName: "Circle",
+          color: "#FF0000",
+          radius: 6
+        }
+      ]
+    }
+  ]
+};
+
+const parser = new SLDParser();
+
+parser
+  .writeStyle(pointSimplePoint)
+  .then(sld => console.log(sld))
+  .catch(error => console.log(error));
+```
+
+Browser:
+
+```js
+const pointSimplePoint = {
+  name: "My Style",
+  rules: [
+    {
+      name: "My Rule",
+      symbolizers: [
+        {
+          kind: "Mark",
+          wellKnownName: "Circle",
+          color: "#FF0000",
+          radius: 6
+        }
+      ]
+    }
+  ]
+};
+var parser = new GeoStylerSLDParser.SldStyleParser();
+parser
+  .writeStyle(geostyle)
+  .then(function(style) {
+    console.log(style);
+  })
+  catch(function(error) {
+    console.log(error);
+  });
+```