docs: add README

README.md

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+# Toolbox
+
+Collection of loosely coupled units for testing libraries in multiple environments.
+
+## Usage
+
+Each unit is designed to be replaceable if your project or environment requires a different setup.
+For the "default" usage there are setup functions that reduce the boilerplate.
+
+```js
+import { setupSourceModuleLoader, setupToolboxTester, setupNodeConductor, setupChromeConductor, serveDir } from '@ph.fritsche/toolbox'
+
+const tester = await setupToolboxTester(
+    [ // Watched files
+        'src',
+        'test'
+    ],
+    [ // Test coductors
+        setupNodeConductor('Node, Dependency version X', [
+            new URL('http://path/to/setup/fileX.js'),
+        ]),
+        setupNodeConductor('Node, Dependency version Y', [
+            new URL('http://path/to/setup/fileY.js'),
+        ]),
+        setupChromeConductor('Chrome, Dependency version X', [
+            new URL('http://path/to/setup/fileX.js'),
+        ]),
+    ],
+    [ // Loaders which e.g. transform TS to JS
+        await setupSourceModuleLoader()
+    ],
+)
+
+// Run the tests with each of the conductors and report combined results
+await tester.start()
+```