add ideas doc

ideas.md

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+# javapool game ideas
+
+## tabbed interface
+
+like https://candybox2.github.io/
+
+* first tab: device count and buying stuff
+* second tab: aerial view of the garden
+* third tab: side view of the pool, all the way to the bottom
+
+## currencies
+
+* devices
+* spoons
+* energy
+
+## shop
+
+* metal detector
+  * can only be bought once
+* batteries
+  * when bought, immediately gives 1 energy
+* water generator
+  * costs N devices and 1 spoon (always one)
+  * lore: the spoon controls the water flowing through the generator,
+    which allows it to power a turbine and produce energy
+  * could implement the notion of a moon phase to make the spoons
+    stronger and cause higher energy production?
+* oxygen bottles
+  * for extra oxygen while swimming in the pool
+* oracle
+  * costs 3 billion devices
+  * ends the game with a thank you note from sun microsystems
+
+## the garden
+
+* you can move around the garden with the arrow keys
+* you can use the detector in the garden for 1 energy
+* you might find a moon rune moonsoon spoon with the detector
+
+## the pool
+
+* if you own a spoon, you can use it to control the water level
+* if you walk into the pool in the garden view, you can then swim around in
+  the pool
+* you have a limited oxygen supply that decays if you are not on the surface
+* if you run out of oxygen, you lose control of the game for a minute
+* you can use the detector on the pool's bottom for 2 energy
+* you might find a bunch of devices or batteries with the detector