Add the main NebulOuS repos

The NebulOuS project aims to deliver a Meta Operating System and
Fog Brokerage Platform for transient cloud continuum ecosystems. [1]

This patch follows the Project Creator's Guide to create a new
project in OpenDev's collaboratory.

It also creates the project-config repo in preparation for the creation
of a new Zuul tenant: nebulous.

[1] https://www.nebulouscloud.eu/

Change-Id: I369177cd43f92f02a73011b46545210015d5112a

gerrit/acls/nebulous/nebulous.config

@@ -0,0 +1,11 @@
+[access "refs/heads/*"]
+abandon = group nebulous-core
+create = group nebulous-release
+label-Code-Review = -2..+2 group nebulous-core
+label-Workflow = -1..+1 group nebulous-core
+
+[receive]
+requireChangeId = true
+
+[submit]
+mergeContent = true

gerrit/acls/nebulous/project-config.config

@@ -0,0 +1,10 @@
+[access "refs/heads/*"]
+abandon = group nebulous-project-config-core
+label-Code-Review = -2..+2 group nebulous-project-config-core
+label-Workflow = -1..+1 group nebulous-project-config-core
+
+[receive]
+requireChangeId = true
+
+[submit]
+mergeContent = true

gerrit/projects.yaml

@@ -204,6 +204,14 @@
   acl-config: /home/gerrit2/acls/opendev/retired.config
 - project: limestone/ci-cloud-config
   description: CI/CD Deployment of Limestone Networks nodepool cloud
+- project: nebulous/nebulous
+  description: >-
+    The main repository of the NebulOuS project - a Meta Operating System
+    and Fog Brokerage Platform for transient cloud continuum ecosystems.
+    https://www.nebulouscloud.eu/
+- project: nebulous/project-config
+  description: >-
+    The Zuul CI's config project repository for the NebulOuS tenant.
 - project: opendev/afsmon
   use-storyboard: true
   groups: