Merge pull request #1785 from yaron2/inmempubsub-1

Add in-memory pub/sub

daprdocs/content/en/reference/components-reference/supported-pubsub/_index.md

@@ -26,6 +26,7 @@ Table captions:
 | [Hazelcast]({{< ref setup-hazelcast.md >}})           | Alpha  | v1 | 1.0 |
 | [MQTT]({{< ref setup-mqtt.md >}})                     | Alpha  | v1 | 1.0 |
 | [NATS Streaming]({{< ref setup-nats-streaming.md >}}) | Beta  | v1 | 1.0 |
+| [In Memory]({{< ref setup-inmemory.md >}}) | Alpha  | v1 | 1.4 |
 | [JetStream]({{< ref setup-jetstream.md >}}) | Alpha  | v1 | 1.4 |
 | [Pulsar]({{< ref setup-pulsar.md >}})                 | Alpha  | v1 | 1.0 |
 | [RabbitMQ]({{< ref setup-rabbitmq.md >}})             | Alpha  | v1 | 1.0 |

daprdocs/content/en/reference/components-reference/supported-pubsub/setup-inmemory.md

@@ -0,0 +1,28 @@
+---
+type: docs
+title: "In Memory"
+linkTitle: "In Memory"
+description: "Detailed documentation on the In Memory pubsub component"
+aliases:
+  - "/operations/components/setup-pubsub/supported-pubsub/setup-inmemory/"
+---
+
+The In Memory pub/sub component is useful for development purposes and works inside of a single machine boundary.
+
+## Component format
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: pubsub
+  namespace: default
+spec:
+  type: pubsub.in-memory
+  version: v1
+```
+
+## Related links
+- [Basic schema for a Dapr component]({{< ref component-schema >}}) in the Related links section
+- Read [this guide]({{< ref "howto-publish-subscribe.md#step-2-publish-a-topic" >}}) for instructions on configuring pub/sub components
+- [Pub/Sub building block]({{< ref pubsub >}})