diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e4f554f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,48 @@
+# What is this?
+
+A quick and simple service for getting pictures of whatever-you-want
+for use as placeholders in your designs or code. Just put your image
+size (width & height) after the URL and you'll get a placeholder.
+
+Similar URL API as [Placekitten](http://placekitten.com).
+
+There is also a bookmarklet service which works the same as
+[Horse_ebookmarklet](http://www.heyben.com/horse_ebookmarklet/).
+
+## Installation
+
+For local development builds, not suitable for production:
+
+1. Go to the code: `cd path/to/holder`
+1. Create and activate a virtualenv.
+1. Get dependencies in place: `pip install -r requirements.txt`
+1. Set up a collection of images.
+   a. Create the directory `./images`.
+   b. Get some images, from [Unsplash](https://unsplash.com) or similar.
+   c. Place images in image directory.
+1. Start the app: `flask run .`
+1. Go to [http://localhost:5000](http://localhost:5000) in your web browser.
+1. Done!
+
+### Run as Container
+
+The most easy and portable way to use this is to use Docker or Podman.
+In this build, waitress is used for production readyness. Port 5099 is
+instead used.
+
+    podman build .
+    podman run -it -p 5099:5099 -v ./images:/app/images <container id>
+
+If you wish to embed images in container as well, use alternate
+Containerfile.
+
+    podman build -f Containerfile.aio --build-arg images=./images .
+    podman run -it -p 5099:5099 <container id>
+
+## Example calls
+
+    # generates an image, 200px wide and 300px tall
+    http://localhost:5000/200/300
+
+    # generates an image in grayscale, 200px wide and 300px tall
+    http://localhost:5000/g/200/300