Added docs to README

Author: RangerMauve

README.md

@@ -1,4 +1,60 @@
 # graphlib-json-graph
 Converts json-graph definitions into graphlib graphs.
 
-**Note: This is a work in progress**
+```
+npm install --save graphlib-json-graph
+```
+
+## Example
+
+```javascript
+var toGraph = require("graphlib-json-graph");
+
+var graphDefinition = {
+    graph: {
+        label: "Example graph",
+        nodes: [{
+            id: "1"
+        }, {
+            id: "2"
+        }],
+        edges: [{
+            id: "e1",
+            directed: true,
+            source: "1",
+            target: "2"
+        }]
+    }
+};
+
+var graph = toGraph(graphDefinition);
+
+graph.nodes(); // ["1", "2"]
+graph.edges(); // {v: "1", w: "2"}
+```
+
+## API
+The module exports one function: `toGraph(graphDefinition)`.
+
+`graphDefinition` is supposed to be an object that conforms with the [json graph specification](https://github.com/jsongraph/json-graph-specification#graphs-object).
+
+The function returns either one, or a list of [graphlib graphs](https://github.com/cpettitt/graphlib/wiki).
+
+The distinction is based on whether you have a `graphs` property or a `graph` property.
+
+## Notes
+- The graph is set to be a `multigraph` by default to support multiple edges that point to the same nodes
+- If you do have multiple edges that connect the same nodes, you must provide an `id` property for them so that you can [differentiate them by name](https://github.com/cpettitt/graphlib/wiki/API-Reference#multigraphs)
+- the `labels` for the nodes and edges in the graph are set to the objects in the definition JSON
+
+## Testing
+Is based on [mochajs](http://mochajs.org/)
+- Clone the repo
+- `npm install`
+- `npm test`
+
+## Contributing
+
+Feel free to [raise an issue](https://github.com/jsongraph/graphlib-json-graph/issues) or [submit a pull request](https://github.com/jsongraph/graphlib-json-graph/pulls)
+
+In terms of styling, please use tabs for indentation