feat(docs): start a developer guide

docs/dev-test.md

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+# Development and Testing
+
+## Contents
+
+- [Development and Testing](#development-and-testing)
+  - [Contents](#contents)
+  - [Development](#development)
+    - [API](#api)
+    - [GUI](#gui)
+      - [Updating Github Pages](#updating-github-pages)
+  - [Testing](#testing)
+    - [Pre-Release Test Plan](#pre-release-test-plan)
+
+## Development
+
+### API
+
+- TODO: testing
+- TODO: lint/style
+
+### GUI
+
+Run `make ci` to build the bundle.
+
+#### Updating Github Pages
+
+Checkout the `gh-pages` branch and run the `copy-bundle.sh` script, assuming you have the project
+checked out to a directory named `onnx-web`.
+
+You can also clone the GH pages branch into its own directory to avoid switching between them.
+
+## Testing
+
+### Pre-Release Test Plan
+
+This is the test plan for manual pre-release testing and should exercise all of the major features.
+
+- txt2img
+  - 256x256 with SD v1.5
+  - 512x512 with SD v1.5
+    - DPM Multi
+    - Euler A
+  - 768x768 with SD v2.1
+- img2img
+  - 256x256 input
+  - 512x512 input
+  - 1024x768 input
+- inpaint
+  - outpaint
+    - 256 all sides
+    - 512 top and bottom, 0 left and right
+    - 512 left and right, 0 top and bottom
+- upscale
+  - Real ESRGAN
+    - with face correction
+    - without face correction
+  - Stable Diffusion
+    - with face correction
+    - without face correction
+- interactions
+  - generate new image
+  - delete pending image
+  - delete finished image
+  - copy to img2img
+  - copy to inpaint