Added a readme file

Author: danbrun

readme.md

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+# GTN Module Editor
+Application for editing AppXpress module exports from the GT-Nexus platform
+
+## How to use
+
+1. Download and run the program
+2. Import a module by entering `import [path-to-zip-file]`
+3. Select a working item path
+   - In module root (command line starts with `/[module-name-here]>`)
+     - Use `ls` to list design roots
+     - Use `cd [design-type]` to select a design root
+     - Use `cd [design-type]/[field-name]` to select a field root
+   - In design root (line starts with `/[module-name-here]/[design-type-here]>`)
+     - Use `ls` to list fields
+     - Use `cd [field-name]` to go to a field root
+     - Use `cd ..` to go back to the module root
+   - In field root (line starts with `/[module-name-here]/[design-type-here]/[field-name-here]>`)
+     - Use `cd ..` to go back to the design root
+     - Use `cd ../..` to go back to the module root
+4. Edit module, design, or field properties
+   - Use `listp` to list the properties on the working item
+   - Use `getp [key]` to get the current value of a property
+   - Use `setp [key] [value]` to set the value of a property
+5. Export your new module using `export [path-to-store-zip]`
+
+## How to build
+
+You will need to install the .NET Core using the instructions [here](https://www.microsoft.com/net/learn/get-started) to build this application.
+Once you've edited the files you want to change, open the repository folder in a terminal and enter `dotnet run`. The .NET Core will build and launch the application automatically.