Create README.md

README.md

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+# persistent_api
+A minetest api that allows for easy creation of persistent effects. for example: changing a players health over time with a set interval (eg; poison or healing)
+
+### how to use:
+Simply use the one function
+```lua
+persistent_api.add_persistent_effect(def)
+```
+like this
+```lua
+persistent_api.add_persistent_effect({
+  name = string,
+  -- effect identifier. Will be overwritten if another effect is added to the same object with the same identifier.
+
+  object = ObjectRef,
+  -- ObjectRef which is referenced and attached to the effect.
+
+  duration = float,
+  -- amount of time until the effect is removed.
+
+  effect = function(ObjectRef)
+  -- function that is run every time the effect is called.
+
+  persistence = float,
+  -- how often (in seconds) the effect function is run.
+})
+```
+for example
+```lua
+local player = minetest.get_player_by_name("JohnSmith")
+
+  persistent_api.add_persistent_effect({
+    name = "damage_player", -- identifier
+    object = player, -- affected object
+    duration = 10, -- this effect will last 10 seconds
+    effect = function(player)
+      player:set_hp(player:get_hp()-1) -- damage the player one half heart
+    end,
+    persistence = 0.1, -- every 0.1 seconds for 10 seconds the previous function will be run.
+  })
+```