Add some placeholder docs for building instructions and platform arch…

…itecture.

developer-docs/README.md

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 Developer Documentation
 =======================
+
+The Educates project consists of the following Git repositories:
+
+* Educates Training Platform - https://github.com/vmware-tanzu-labs/educates-training-platform
+* Educates Packages Repository - https://github.com/vmware-tanzu-labs/educates-packages
+* Educates User Documentation - https://github.com/vmware-tanzu-labs/educates-docs
+* Educates GitHub Actions - https://github.com/vmware-tanzu-labs/educates-github-actions
+
+Educates Training Platform (this repository), holds all source code for building and making releases of the core platform.
+
+Educates Packages Repository holds the definitions used to generate the Carvel packages from which Educates can be installed using the Carvel ``kapp-controller`` operator.
+
+Educates User Documentation holds the source files for user documentation hosted on https://docs.educates.dev/.
+
+Educates GitHub Actions holds GitHub actions to assist in publishing workshops to GitHub container registry.
+
+If wanting to contribute to Educates, you can build and deploy a local copy of Educates by following the [build instructions](build-instructions.md).
+
+For details on the design of Educates and how it works check out notes on it's [platform architecture](platform-architecture.md).

developer-docs/build-instructions.md

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+Build Instructions
+==================
+
+...

developer-docs/platform-architecture.md

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+Platform Architecture
+=====================
+
+...