Merge pull request #71 from pnnl/add-sample-hpxmls-prod-sandbox

Add sample hpxmls

Author: mvgeorgescu

hpxml_examples/hpxml_examples/README.md

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+# HPXML Examples
+
+This directory contains minimal example HPXML files demonstrating:
+
+- HPXML file purposes
+  - Pre-retrofit
+  - Post-retrofit
+  - Pre- and post-retrofit
+
+- Modeled rebate schematron classifications
+  - Required
+  - Recommended
+
+## Notes
+
+- The v2 examples demonstrate the three file purposes:
+  - pre-retrofit
+  - post-retrofit
+  - pre- and post-retrofit
+- The v4 examples demonstrate the modeled rebate schematrons:
+  - required
+  - recommended
+- The v4 examples use the pre- and post-retrofit file purpose.
+- Earlier HPXML versions can still represent modeled rebate workflows, but only v4 files can be validated against the modeled rebate schematrons.