Add README to base-template/

base-template/README.md

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+# What's in the base-template directory
+
+This base-template directory contains templates and guides to be followed by a `doctype` template author. They can also be used by a project's docset owner select and customize the project's templates.
+
+**Version:** 0.1
+
+**Last updated:** February, 2021
+
+## How to use the base-template files 
+As a doctype author, you will be responsible for creating three documents:
+
+**xxx-template:**
+* Based on the _base-doctype-template_.
+* The doctype's headings, standard text, and specific instructions for each section.
+
+**xxx-guide-template:**
+* Based on the _base-doctype-guide-template_.
+* General guidance and background theory related to the _doctype_.
+
+**xxx-example:**
+* Based on the _doctype-example-guide_.
+* An example implementation of the doctype, which explains our fake chronologue project.
+
+Guidance for filling out these documents are provided as _template author tips_ within the above documents, as well as in the holistic _main-doctype-author-guide_.
+
+## Contributing new templates
+
+We welcome contributions to The Good Docs Project. Refer to our [contribution page](https://thegooddocsproject.dev/contribute.html) for details.