Added details for Camel Source and link to example (#1108)

* Added details for Camel Source and link to example

* Added note about Camel-K requirement for CamelSource and link to installation docs

docs/eventing/README.md

@@ -268,6 +268,24 @@ The KafkaSource reads events from an Apache Kafka Cluster, and passes these to a
 
 See the [Kafka Source](https://github.com/knative/eventing-sources/tree/master/contrib/kafka/samples) example.
 
+### CamelSource
+
+A CamelSource is an event source that can represent any existing [Apache Camel component](https://github.com/apache/camel/tree/master/components) that provides a consumer side, and enables publishing events to an addressable endpoint. Each Camel endpoint has the form of a URI where the scheme is the ID of the component to use.
+
+CamelSource requires [Camel-K](https://github.com/apache/camel-k#installation) to be installed into the current namespace.
+
+**Spec fields**:
+
+- source: information on the kind of Camel source that should be created.
+  - component: the default kind of source, enables creating an EventSource by configuring a single Camel component.
+    - uri: `string` contains the Camel URI that should be used to push events into the target sink.
+    - properties: `key/value map` contains Camel global options or component specific configuration. Options are available in the documentation of each existing Apache Camel component.
+- serviceAccountName: `string` an optional service account that can be used to run the source pod.
+- image: `string` an optional base image to use for the source pod, mainly for development purposes.
+
+See the [CamelSource](https://github.com/knative/eventing-sources/blob/master/contrib/camel/samples/README.md) example.
+
+
 ## Getting Started
 
 - [Setup Knative Serving](../install/README.md)