Added doco regarding Datadog installation

Signed-off-by: Brett Wright <brett.wright@bestseller.com>
Signed-off-by: Brett Wright <wright.brett@gmail.com>

docs/integrations/datadog-rum/installation.md

@@ -0,0 +1,30 @@
+---
+id: installation
+title: Datadog RUM Installation
+sidebar_label: Installation
+# prettier-ignore
+description: Adding Datadog RUM to Your App
+---
+
+There is a basic [Datadog](https://docs.datadoghq.com/real_user_monitoring/)
+integration built into Backstage. You can enable it by adding the following to
+your app configuration:
+
+```yaml
+app:
+  datadogRum:
+    clientToken: '123456789'
+    applicationId: qwerty
+  #   site: # datadoghq.eu default = datadoghq.com
+  #   env: # optional
+```
+
+Replace the clientToken and applicationId with the ones generated for you
+datadog.
+
+optional arguments:
+
+```
+site: datadoghq.eu # default equals datadoghq.com
+env: dev # allow to specify the environment
+```

docs/plugins/observability.md

@@ -13,6 +13,11 @@ Backstage integrator.
 See how to install Google Analytics in your app
 [here](../integrations/google-analytics/installation.md)
 
+## Datadog RUM Events
+
+See how to install Datadog Events in your app
+[here](../integrations/datadog-rum/installation.md)
+
 ## Logging
 
 The backend supplies a central [winston](https://github.com/winstonjs/winston)