docs: Add a minimal README to Wave Studio.

Author: mturoci

studio/README.md

@@ -0,0 +1,27 @@
+# Wave Studio
+
+In-browser IDE for building Wave apps. No local environment setup needed.
+
+## Building for H2O Appstore
+
+A common ask for this app is to install arbitrary python dependencies. Even though there is no such native feature [yet](https://github.com/h2oai/wave/issues/2193), it's possible to achieve via custom build.
+
+The steps below work on Linux/MacOS. For MacOS one needs to run `brew install gsed` if hasn't done already.
+
+Clone the repo first.
+
+```sh
+git clone https://github.com/h2oai/wave
+```
+
+Then update the [requirements.txt](https://github.com/h2oai/wave/blob/main/studio/requirements.txt) file with your desired dependencies.
+
+Once done, make a new build
+
+```sh
+cd studio
+make setup
+VERSION=1.2.3 make build
+```
+
+If there were no errors, your `.wave` bundle should be located at `build/apps/wave-studio`. Once complete, you are ready to deploy the bundle into Appstore and start coding!