ern: add page (#8229)

* ern: add page

* ern: fix end line colons

* ern: update based on review feedback

* ern: use infinite tense in desc over present

* ern: use infinitive tense in desc over present

* ern: update based on review part 2

pages/common/ern.md

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+# ern
+
+> Electrode Native platform command line client.
+> More information: <https://native.electrode.io/reference/index-6>.
+
+- Create a new `ern` application (`MiniApp`):
+
+`ern create-miniapp {{application_name}}`
+
+- Run one or more `MiniApps` in the iOS / Android Runner application:
+
+`ern run-{{ios|android}}`
+
+- Create an Electrode Native container:
+
+`ern create-container --miniapps {{/path/to/miniapp_directory}} --platform {{ios|android}}`
+
+- Publish an Electrode Native container to a local Maven repository:
+
+`ern publish-container --publisher {{maven}} --platform {{android}} --extra {{'{"groupId":"com.walmart.ern","artifactId":"quickstart"}'}}`
+
+- Transform an iOS container into a pre-compiled binary framework:
+
+`ern transform-container --platform {{ios}} --transformer {{xcframework}}`
+
+- List all installed versions of Electrode Native:
+
+`ern platform versions`
+
+- Set a logging level:
+
+`ern platform config set logLevel {{trace|debug}}`