adding sregistry page

Author: vsoch

_data/sidebars/main_sidebar.yml

@@ -47,6 +47,9 @@ entries:
       url: /install-windows
       output: web, pdf
 
+    - title: Host a Singularity Registry
+      url: /singularity-registry
+      output: web, pdf
 
   - title: Contributing
     output: web, pdf

assets/img/diagram/container_treemap.png

@@ -13,7 +13,7 @@ Singularity enables users to have full control of their environment. Singularity
    <img style="max-width:900px" src="/assets/img/diagram/singularity-2.4-flow.png">
 </a>
 
-It's pretty simple. You can make and customize containers locally, and then run them on your shared resource. As of version 2.3, you can even import Docker image content without sudo permissions. Singularity also allows you to leverage the resources of whatever host you are on. This includes HPC interconnects, resource managers, file systems, GPUs and/or accelerators, etc. Singularity does this by enabling several key facets:
+It's pretty simple. You can make and customize containers locally, and then run them on your shared resource. As of version 2.3, you can even pull Docker image layers into a new Singularity image without sudo permissions. Singularity also allows you to leverage the resources of whatever host you are on. This includes HPC interconnects, resource managers, file systems, GPUs and/or accelerators, etc. Singularity does this by enabling several key facets:
 
 * Encapsulation of the environment
 * Containers are image based

assets/img/diagram/singularity-2.4-flow.png

@@ -0,0 +1,32 @@
+---
+title: Host a Singularity Registry
+sidebar: main_sidebar
+permalink: singularity-registry
+toc: false
+---
+
+In response to our users, @vsoch has developed a local registry for institutions
+or users, <a href="https://github.com/singularityhub/sregistry" target="_blank">Singularity Registry</a>,
+to deploy on their resources to manage and serve singularity images.  With Singularity Registry you can:
+
+ * build to your on you local resource, or a continuous integration server
+ * push images to the registry
+ * manage images in collections, by tags, or metadata
+ * visualize collections of images to assess size
+
+<a href="/assets/img/diagram/container_treemap.png" target="_blank" class="no-after">
+   <img style="max-width:900px" src="/assets/img/diagram/container_treemap.png">
+</a>
+
+Public images in your registry are immediately available via the Singularity command line software via the `shub://` unique resource identifier:
+
+```
+singularity pull shub://vsoch/hello-world
+```
+
+If you don't want to build or host your own images, then you would be interested to use <a href="https://www.singularity-hub.org" target="_blank">Singularity Hub</a>,
+
+<a target="_blank" class="btn btn-primary navbar-btn cursorNorm" style="color:white;height: 42px;padding-top: 10px;" role="button" href="https://singularityhub.github.io/sregistry">Documentation</a> 
+<a target="_blank" href="https://www.github.com/singularityhub/sregistry" class="btn btn-primary navbar-btn cursorNorm no-after" role="button"><i style="color:white" class="fa fa-github fa-2x"></i></a>
+
+