Add CloudShell terminal like Che editor. (#326)

Signed-off-by: Oleksandr Andriienko <oandriie@redhat.com>
Co-authored-by: Sergii Leshchenko <sleshche@redhat.com>

v3/plugins/eclipse/cloud-shell/latest.txt

@@ -0,0 +1 @@
+nightly

v3/plugins/eclipse/cloud-shell/nightly/meta.yaml

@@ -0,0 +1,28 @@
+apiVersion: v2
+publisher: eclipse
+name: cloud-shell
+version: nightly
+type: Che Editor
+displayName: Cloud Shell Editor
+title: Cloud Shell Editor
+description: Cloud Shell provides an ability to use terminal widget like an editor.
+icon: https://www.eclipse.org/che/images/logo-eclipseche.svg
+repository: https://github.com/eclipse/che-machine-exec/
+firstPublicationDate: "2020-01-29"
+category: Other
+spec:
+  endpoints:
+   -  name: cloud-shell
+      public: true
+      targetPort: 4444
+      attributes:
+        protocol: http
+        type: ide
+        discoverable: false
+        secure: true
+        cookiesAuthEnabled: true
+  containers:
+   - name: che-machine-exec
+     image: "quay.io/eclipse/che-machine-exec:nightly"
+     ports:
+       - exposedPort: 4444