Schema documentation (#50)

* updated vscode settings to exclude node_modules from editor

* added test reference documentation

.vscode/settings.json

@@ -1,3 +1,7 @@
 {
-    "editor.tabSize": 2
+    "editor.tabSize": 2,
+    "files.exclude": {
+        "**/coverage": true,
+        "**/node_modules": true
+    }
 }

TestFramework-Reference.md

@@ -0,0 +1,43 @@
+# Test Framework - Reference
+
+This collection of resources is intended to support development efforts for the test frameworks supported by test-parser.
+
+- **Cucumber**:
+
+  Cucumber was created several years before the JSON Schema standard started gaining traction. The lack of formal schema led to inconsistencies between different Cucumber implementations and releases. The [cucumber-json-converter](https://github.com/cucumber/cucumber-json-converter) project offers the best reference schema:
+  - [behave][behave]
+  - [cucumber-js][cucumber-js]
+  - [cucumber-jvm][cucumber-jvm]
+  - [cucumber-ruby][cucumber-ruby]
+
+[behave]: https://github.com/cucumber/cucumber-json-converter/blob/main/src/behave/BehaveSchema.ts
+[cucumber-js]: https://github.com/cucumber/cucumber-json-converter/blob/main/src/cucumber-js/CucumberJsSchema.ts
+[cucumber-jvm]: https://github.com/cucumber/cucumber-json-converter/blob/main/src/cucumber-jvm/CucumberJvmSchema.ts
+[cucumber-ruby]: https://github.com/cucumber/cucumber-json-converter/blob/main/src/cucumber-ruby/CucumberRubySchema.ts
+
+- **JUnit**:
+
+  Several attempts have been made to nail down JUnit's schema:
+
+  - Schema: <https://github.com/windyroad/JUnit-Schema/blob/master/JUnit.xsd> - referenced by [IBM's outline][ibm-ref] for JUnit schema
+  - Schema: <https://github.com/junit-team/junit5/blob/main/platform-tests/src/test/resources/jenkins-junit.xsd> - referenced by github issue [junit-team/2625][github-issue-2625]
+
+[github-issue-2625]: https://github.com/junit-team/junit5/issues/2625
+[ibm-ref]: https://www.ibm.com/docs/en/developer-for-zos/16.0?topic=formats-junit-xml-format
+
+- **MSTest**:
+
+  - The XSD schema for MSTest is installed with Visual Studio at `%Program Files%\Microsoft Visual Studio\<version>\Xml\Schemas\vstst.xd`
+
+- **NUnit**:
+
+  - NUnit v2 schema: <https://nunit.org/files/testresult_schema_25.txt>
+  - NUnit v3 documentation: <https://docs.nunit.org/articles/nunit/technical-notes/usage/Test-Result-XML-Format.html>
+
+- **TestNG**:
+
+  - Xml reporter: <https://testng-docs.readthedocs.io/testresults/#xml-reports>
+
+- **xUnit**:
+
+  - xUnit v2+ schema: <https://xunit.net/docs/format-xml-v2>