add roadmap md file

docs/roadmap.md

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+# Roadmap
+
+- [ ] Test Map
+- [ ] Mobile Controls
+- [ ] Vehicles
+- [ ] Swimming (inkl. Oxygen-Meter)
+- [ ] Global Progress Object
+- [ ] Spores
+- [ ] Boss Battles
+
+## Biomes & Levelsetups
+
+- above sealevel
+
+  - islands with different biomes (desert (with pyramid), forest/jungle, mysterious swamp, crystal)
+  - islands are connected via underwater cave system
+
+- below sealevel
+
+  - caves (regular, ice, colorful underground mushroom forest (game should never feel gloomy but fun!), deep sea alien?)
+
+- boss-levels
+
+## Objects & Variables
+
+- GlobalProgress
+
+```json
+GlobalProgress {
+  "player": {
+  "currentHitpoints": 3,
+  "maxHitpoints": 5,
+  "collectedCrystals": 26,
+  "ammo": {
+   "blaster": 10,
+   "rocketLauncher": 5,
+   "pulseRifle": 20,
+  },
+  "x": 53, // ?
+  "y": 345, // ?
+  "inVehicle": false, // ?
+ },
+ "upgrades": {
+  "jumpBoots": false,
+  "fins": false, // faster swimming
+  "oxygenTank1": false,
+  "oxygenTank2": false,
+ },
+ "weapons": {
+  "blaster": true,
+  "rocketLauncher": false,
+  "pulseRifle": false, // high firing rate, low damage
+ },
+ "beatenBosses": {
+  "boss1": true,
+  "boss2": false,
+  "boss3": false,
+ },
+ "vehicles": {
+  "submarine": {
+   "batteryLvl1": true,
+   "batteryLvl2": false,
+   "thermalConverter": false, // regenerate battery at thermal vents
+   "hullPlating": false,
+  },
+ },
+}
+```