Rough outlines for new documentation/guides

guides/Getting-Started.md

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+# Getting Started With Test262
+
+
+Rough outline...
+
+
+- Why do we test?
+- What do we test? 
+  - Similar to https://github.com/tc39/test262/blob/main/CONTRIBUTING.md#acceptable-tests and https://github.com/tc39/test262/blob/main/CONTRIBUTING.md#unacceptable-tests
+- Anatomy of a test
+  - frontmatter
+    - esid
+    - description
+    - don't mention any other frontmatter
+  - test code
+    - assert api
+- Write a test
+- Run your test (links to Running-Tests.md)
+

guides/Running-Tests.md

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+# Running Tests
+
+- Explain Test262-Harness
+  - Explain role of eshost
+  - Explain role of esvu
+- How to set up Test262-Harness
+  - Borrow from https://github.com/bterlson/test262-harness#getting-started
+- Provide a bunch of common and useful examples of test262-harness commands, with explanations of what is happening and what to expect
+  - Speeding up with threads
+  - Specifying engines-specific host args
+  - filtering tests with `--features`
+  - Polyfill injection with `--prelude`
+  - Code tranformation intermediary with `--transformer`	
+  - Code preprocessing and outcome overide with `--preprocessor`