add initial testing strategy document

Author: CarsonDavis

docs/architecture-decisions/testing_strategy.md

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+## Overview
+As of early 2025, we have only recently been writing tests for new features, and have about 250 tests in total, mostly centered around the EJ portal, the reindexing process, and pattern applications. 
+
+Although this covers much of the core system logic, there still remain a number of untested logical areas such as the config file generation, core project settings, frontend features, etc.
+
+This document outlines a testing strategy for the project, which will guide us towards adding tests in the most critical areas first, followed by a plan to fully cover the remaining areas.
+
+## Current Coverage
+Using the coverage library, the following report was generated:
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+
+