Added mana and changed position in hotbar

mods/mana/README.txt

@@ -0,0 +1,51 @@
+Mana mod [mana]
+===============
+Version: 1.0.1
+Note: This mod uses semantic versioning, as defined by version 2.0.0 of the SemVer standard.
+See: <http://semver.org/>
+
+Description
+===========
+This mod adds basic support for mana to Minetest.
+
+Each player will have an additional attribute: Mana. To be precise:
+
+- Current mana reserves: How much mana the player currently has
+- Maximum possible mana: How much mana the player can have at maximum
+- Mana regeneration amont: How much mana will be generated each “mana tick” (default 0.2 seconds)
+
+By default, each player spawns with 0/200 mana, and regenerates 1 mana per fifth of a second. All
+these values can be configured with the server settings (`minetest.conf`) and it is highly advised to do
+so if you plan to integrate this mod into a subgame.
+
+The mana regeneration rate (the “mana tick”) is a global setting and is *not* configured on a
+per-player basis.
+
+The mod provides a simple API to set, get, add and subtract the mana (and maximum) mana of any player, and
+for setting the regeneration amount. Note that this mod itself does *not* change the gameplay in a meaningful
+way. You should install other mods which use the Mana mod as a dependency.
+
+The API documentation is in the file API.md.
+
+If the mod “HUD bars” [hudbars] is installed, a blue bar will be added to the HUD showing the player's mana reserves.
+It currently only works with version 0.3.0 of this mod.
+
+Otherwise, the mana is just shown as text.
+
+Configuration
+=============
+
+This mod can be configured with minetest.conf! The following settings are accepted:
+
+* `mana_default_max`: Initial max. mana given to new players. Default: `200`. This value must be non-negative.
+* `mana_default_regen`: Initial regenerated mana per “mana tick”. Default: `1`. This value must be non-negative.
+* `mana_regen_timer`: The length of a “mana tick” in seconds. Each player will get his/her mana increased by the current
+  regen value per mana tick. Default: `0.2`. This value must be positive, also try to avoid very small values
+  as those could probably stress your machine a lot.
+
+
+License information
+===================
+* textures/mana_icon.png: CC-BY by Buch <http://opengameart.org/users/Buch>.
+* textures/mana_bar.png: WTFPL by Wuzzy.
+* Everything else: WTFPL.