ENH: added template instructions

Created a document that includes instructions for using this template package.

INSTRUCTIONS.md

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+This repository provides a template for creating a pysat Ecosystem package. The
+files within are all examples for the GitHub community standards, continuous
+integration, PyPi support, documentation, and basic installation documents
+needed for a pysat Ecosystem package. Adhering to these standards is not
+required, but will assist in package maintenance.
+
+In all of these documents, PACKAGENAME is used in place of the pysat Ecosystem
+package name. Please proof read each document carefully before applying it and
+consider submitting changes and improvements to these templates as Issues or
+Pull Requests to this repository.
+
+Contents
+========
+
+Community Documents
+-------------------
+
+* README.md
+* CODE_OF_CONDUCT.md
+* CONTRIBUTING.md
+* LICENSE
+* .gitignore
+* .github/pull_request_template.md
+* .github/ISSUE_TEMPLATE/bug_report.md
+* .github/ISSUE_TEMPLATE/feature_request.md
+* .github/ISSUE_TEMPLATE/question.md
+
+Continuous Integration
+----------------------
+
+* .github/workflows/docs.yml
+* .github/workflows/main.yml
+* .github/workflows/pip_rc_install.yml
+* .github/workflows/pysat_rc.yml
+
+Documentation
+-------------
+
+* .readthedocs.yml
+* docs/Makefile
+* docs/conf.py
+* docs/figures/packagename_logo.jpg
+
+Installation/Python Basics
+--------------------------
+
+* MANIFEST.in
+* pyproject.toml
+* requirements.txt
+* setup.cfg
+* test_requirements.txt
+* PACKAGENAME/__init__.py