tests - move readme around

test/unit/README.md

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+# Unit Tests
+
+## Run (inside Electron)
+
+The best way to run the unit tests is from the terminal. To make development changes to unit tests you need to be running `yarn watch`. See [Development Workflow](https://github.com/Microsoft/vscode/wiki/How-to-Contribute#incremental-build) for more details. From the `vscode` folder run:
+
+**OS X and Linux**
+
+	./scripts/test.sh
+
+**Windows**
+
+	scripts\test
+
+
+## Run (inside browser)
+
+You can run tests inside a browser instance too:
+
+**OS X and Linux**
+
+	node test/unit/browser/index.js
+
+**Windows**
+
+	node test\unit\browser\index.js
+
+
+## Debug
+
+To debug tests use `--debug` when running the test script. Also, the set of tests can be reduced with the `--run` and `--runGlob` flags. Both require a file path/pattern. Like so:
+
+	./scripts/test.sh --debug --runGrep **/extHost*.test.js
+
+## Coverage
+
+The following command will create a `coverage` folder at the root of the workspace:
+
+**OS X and Linux**
+
+	./scripts/test.sh --coverage
+
+**Windows**
+
+	scripts\test --coverage