Add a readme for instructions

Building and Running the WebForms application.

src/Web/Catalog.WebForms/readme.md

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+# Running the Catalog Editor WebForms application
+
+You can run the catalog editor Web Forms application locally, using
+hard coded catalog data, or in a set of Windows based Docker Containers,
+using the catalog microservice.
+
+To run locally, you edit the [web.config](web.config) file to set the
+`usefake` flag to true:
+
+```xml
+  <appSettings>
+    <add key="usefake" value="true" />
+    <add key ="CatalogURL" value="http://catalog.api:5101" />
+  </appSettings>
+```
+
+Set that value to `false` to run with the full catalog microservice.
+
+Then, set the startup project in Visual Studio to the *Catalog.WebForms* project. Build and run, and test the application.
+
+## Configure Windows Containers
+
+The Catalog.WebForms project uses the full framework, so will only run in Windows based Docker containers. Before running in Docker, make sure you
+are running Docker with Windows containers configured. Right-click on the Docker node, and if "switch to Windows Containers" is displayed, click that. If "switch to Linux containers" is displayed, you are already running
+with Windows containers.
+
+## Update Configured IP address
+
+There is a current limitation in Docker for Windows when running with
+Windows containers where *localhost* doesn't resolve to the Docker host IP.
+Instead, you need to find the physical machine's IP address and use that for
+the external address of the services.
+
+To find your machine's IP address, run `ipconfig`. Find the IPv4 address
+for your machine. In the GitHub example, it is configured for a home
+network, and the address is `192.168.1.103`.
+
+Edit the *.env* file and set the `ESHOP_EXTERNAL_DNS_NAME_OR_IP` to
+your machine's address.
+
+```yml
+ESHOP_EXTERNAL_DNS_NAME_OR_IP=192.168.1.103
+```
+
+## Building for Docker
+
+The Visual Studio tooling to build and start the docker application isn't
+available yet for Windows containers. We'll update this example when it
+is.
+
+In the meantime, you can build all the .NET Core based projects from the 
+command line.
+
+From the *WebForms.Catalog* direcotry, type the following two commands:
+
+```powershell
+dotnet restore Catalog.WebForms.sln
+dotnet publish Catalog.WebForms.sln -c Release -o ./obj/Docker/publish
+```
+
+You will get errors from the WebForms based project, but you can ignore those.
+You now must build the *Catalog.WebForms* project in Visual Studio, and
+publish it. There is a publish profile that publishes the WebForms project
+to the correct directory, *./obj/Docker/publish*.
+
+Once you've built the project, you build the Docker images and start the application with these two commands:
+
+```powershell
+docker-compose -f docker-compose.yml -f docker-compose.override.yml build
+docker-compose -f docker-compose.yml -f docker-compose.override.yml up
+```
+
+When you run the second command, the Docker host will run the application.
+Open a browser, and navigate to the IP address you retrieved from *ipconfig*
+earlier. (In the example, it would be http://192.168.1.103)
+
+## Roadmap and updates
+
+As the tooling matures, we'll update the application and these instructions
+with simpler steps to run the application.