docs(readme): add custom nodes and custom edges sections

README.md

@@ -31,15 +31,15 @@ const BasicGraph = () => (
 
 # Props
 
-- `elements`: array with nodes and edges
+- `elements`: array of [nodes](#nodes) and [edges](#edges) (required)
 - `onElementClick`: element click handler
 - `onElementsRemove`: element remove handler
 - `onNodeDragStop`: node drag stop handler
 - `onConnect`: connect handler
 - `onLoad`: editor load handler
 - `onMove`: move handler
-- `nodeTypes`: object with node types
-- `edgeTypes`: object with node types
+- `nodeTypes`: object with [node types](#node-types)
+- `edgeTypes`: object with [edge types](#edge-types)
 - `style`: css style passed to the wrapper
 - `connectionLineType`: connection line type = `straight` or `bezier`
 - `connectionLineStyle`: connection style as svg attributes
@@ -53,7 +53,115 @@ const BasicGraph = () => (
 - `snapGrid`: [x, y] array - default: `[16, 16]`
 - `onlyRenderVisibleNodes`: default: `true`
 
+## Nodes
+
+There are three different [node types](#node-types) (`default`, `input`, `output`) you can use. You can also create [custom nodes](#custom-nodes).
+
+Node example: `{ id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 } }`
+
+*Node Props*
+
+- `id`: string (required)
+- `position`: { x: number, y: number } (required)
+- `data`: {} (required if you are using a standard type, otherwise depends on your implementation)
+- `type`: 'input' | 'output' | 'default' or a custom one you implemented
+- `style`: css properties
+
+## Edges
+
+There are three [edge types](#edge-types) (`straight`, `default`, `step`) you can use. The default type is `default`. You can also create [custom edges](#custom-edges).
+
+Edge example: `{ id: 'e1-2', type: 'straight', source: '1', target: '2', animated: true }`
+
+*Edge Props*
+
+- `id`: string (required)
+- `source`: string (required)
+- `target`: string (required)
+- `type`: 'input' | 'output' | 'default' or a custom one you implemented
+- `animated`: boolean
+- `style`: css properties
+
+## Node Types / Custom Nodes
+
+The standard node types are `input`, `default` and `output`. The default node types object looks like this:
+
+```javascript
+{
+  input: InputNode,
+  default: DefaultNode,
+  output: OutputNode
+}
+```
+
+The keys represent the type names and the values are the node components that gets rendered.
+If you want to introduce a new node type you can pass a node types object like this:
+
+```javascript
+nodeTypes={{
+  special: MyCustomNode
+}}
+```
+
+You can now use type `special` for a node.
+The `default`, `input` and `output` types will be still available except you overwrite one of them.
+You can find an example of how to implement a custom node in [custom nodes example](example/src/CustomNodes).
+
+# Edge Types / Custom Edges
+
+The standard edge types are `straight`, `default` and `step`. The default edge types object looks like this:
+
+```javascript
+{
+  default: BezierEdge,
+  straight: StraightEdge,
+  step: StepEdge
+}
+```
+
+The keys represents the type name and the value is the edge component.
+If you want to introduce a new edge type you can pass a edge types object like this:
+
+```javascript
+edgeTypes={{
+  special: MyCustomEdge
+}}
+```
+
+You can now use type `special` for an edge.
+The `straight`, `default` and `step` types will be still available except you overwrite one of them.
+
 # Plugins
 
-- Mini map
-- Controls: zoom & fit view
+## MiniMap
+
+You can use the MiniMap plugin by passing it as a children of you graph:
+
+```javascript
+import Graph, { MiniMap } from 'react-flow';
+
+const GraphWithMiniMap = () => (
+  <Graph
+    elements={elements}
+  >
+    <MiniMap />
+  </Graph>
+);
+```
+
+*Props*
+
+- `nodeColor`: string | function - if you pass a color as a string all nodes will get that color. If you pass a function you can return a color depending on the node.
+- `nodeBorderRadius`: number
+- `maskColor`: string
+- `style`: css properties
+- `className`: class name
+
+## Controls
+
+The control panel contains a zoom-in, zoom-out and a fit-view button.
+
+*Props*
+
+- `style`: css properties
+- `className`: class name