Add initial documentation files: CHANGELOG.md, FAQ.md, and User Guide

CHANGELOG.md

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+# Change Log
+
+<!-- TODO: Add description for CHANGELOG.md -->

FAQ.md

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+# Frequently Asked Questions (FAQ)
+
+<!-- TODO: Add FAQ content -->

userguide/README.md

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+# User Guide
+
+<!-- TODO: Create a user guide for Calminer. This should include instructions on how to use the various features of the application, along with screenshots and examples where applicable. -->