Add missing engine features list

MISSING_ENGINE_FEATURES.md

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+# Missing features in Minetest to recreate Minecraft features
+
+A side goal of the MineClone 2 project is to find any shortcomings of Minetest which make it impossible to recreate a Minecraft feature exactly.
+This file lists some of the missing features in Minetest which MineClone 2 would require.MineClone 2 would require.MineClone 2 would require.MineClone 2 would require.
+
+## No workaround possible
+For these features, no easy Lua workaround could be found.
+
+### Lua API
+#### Tools/wielded item
+- Allow **much** faster liquid flowing
+- “Lock” hotbar for a brief time after using an item, making it impossible to switch item or to attach/mine/build until the delay is over (For eating with delay)
+- Tool charging: Holding down the mouse and releasing it, applying a “power level” (For bow and arrows, more charge = higher arrow range)
+- [Dual Wielding](http://minecraft.gamepedia.com/Dual_wield)
+- Eating/drinking animation
+
+#### Nodes
+- Light level 15 for nodes (not sunlight)
+
+## Interface
+- Inventory: Hold down right mouse button while holding an item stack to drop items into the slots as you move the mouse. Makes crafting MUCH faster
+- **Much** more informative item tooltips
+- Sneak+Leftclick on crafting output crafts as many items as possible and immediately puts it into the player inventory
+
+## Workaround theoretically possible
+For these features, a workaround (or hack ;-)) by using Lua is theoretically possible. But engine support would be clearly better, more performant, more reliable, etc.
+
+### Lua API
+#### Nodes
+- Change walking speed on block (soul sand)
+- Change jumping height on block (soul sand), 
+- Change object movement speed *through* a block, but for non-liquids (for cobweb)
+- Add `on_walk_over` event
+- Set frequency in which players lose breath. 2 seconds are hardcoded in Minetest, in Minecraft it's 1 second
+- Set damage frequency of `damage_per_second`. In Minecraft many things damage players every half-second rather than every second
+- Possible to damage players directly when they are with the head inside. This allows to add Minecraft-like suffocation