Add readme

README.md

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-# image-stitcher
-Stitch images
+# Image Stitcher
+Stitch images together horizontally or vertically.
+
+![MIT licence](https://img.shields.io/badge/license-MIT-green)
+![javascript](https://img.shields.io/badge/vanilla-JavaScript-blue)
+
+## Usage
+- Drop the images on the droplet. All images are shown on a list.
+- You can reorder the images via drag and drop.
+- Delete them by dropping them over the Delete button.
+- Press the delete button to delete all images.
+- Select horizontal or vertical mode.
+- Hit save button to create the stitched image.
+- You can save it by downloading or copy it by right click.
+- If you like to switch the mode, do so and hit the save button, again.
+
+No server required. You can open the **index.html** in the browser.