Initial commit: two Clojure Android todo apps

Side-by-side comparison of viable Clojure-on-Android approaches:
- todo-expo/: ClojureScript + shadow-cljs + Expo + Reagent + re-frame
- todo-flutter/: ClojureDart + Flutter

Both apps feature: add/remove/check-off todos, SQLite persistence,
categories, priorities, edit support, swipe-to-delete, filtering.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

todo-expo/eas-build-pre-install.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+# If the OS is MacOS, install Java so that the shadow-cljs build succeeds
+if [[ $OSTYPE == "darwin"* ]]; then
+  brew install openjdk@11
+  sudo ln -sfn /opt/homebrew/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk || { echo 'Homebrew JDK 11 not found?' ; exit 1; }
+  echo 'export PATH="/opt/homebrew/opt/openjdk@11/bin:$PATH"' >>~/.zshrc
+  export CPPFLAGS="-I/opt/homebrew/opt/openjdk@11/include"
+fi