initial basic readme version added to acceptance tests

Dfe.Data.SearchPrototype/Web/Tests/Acceptance/README.md

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+# Performance Tables Web Tests
+
+[[_TOC_]]
+
+## Overview
+
+This test suite contains automated tests that check the functional and non-functional aspects of the search prototype application.
+
+## Test Levels
+
+- Functional
+  - Acceptance testing
+- Non-functional
+  - Accessibility testing
+
+## Languages
+
+C#
+
+## Tools
+
+- [SpecFlow](https://specflow.org/)
+- [Axe-core](https://github.com/dequelabs/axe-core/tree/develop)
+
+## Contribution
+
+Branches should be in the format `[contributor-initials]/test-[ticket-number]-[feature-description]`.