Created PlaceholderAPI (markdown)

PlaceholderAPI.md

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+![Plan Header](https://puu.sh/AXSg7/5f2f78c06c.jpg)
+
+# PlaceholderAPI
+
+Plan has some placeholders.
+
+> 📢 **Important**
+> 
+> Plan fetches data from database for the placeholders, and the values are not cached.  
+> **DO NOT USE the placeholders in scoreboards, tab list or anything that updates frequently**
+
+Page version: **5.0 build 382**
+
+## List of Placeholders
+
+Use placeholders like this: `%plan_<placeholder>%`
+
+### Player
+
+These placeholders are about the player who sees the placeholder. 
+
+```
+player_banned
+player_operator
+player_sessions_count
+player_kick_count
+
+player_death_count
+player_mob_kill_count
+player_player_kill_count
+player_kill_death_ratio
+
+player_ping_average_day
+player_ping_average_week
+player_ping_average_month
+
+player_lastseen
+player_registered
+
+player_time_active
+player_time_afk
+player_time_total
+player_time_day
+player_time_week
+player_time_month
+
+player_server_time_active
+player_server_time_afk
+player_server_time_total
+player_server_time_day
+player_server_time_week
+player_server_time_month
+
+player_favorite_server
+```
+
+### World
+
+These placeholders are about a specific world
+
+```
+worlds_playtime_total_%worldname%
+```
+Change `%worldname%` with the name of the world like `world_nether`
+
+### Server
+
+These placeholders are about the server the placeholder is used on
+
+```
+operators_total
+
+sessions_play_time_total
+sessions_play_time_day
+sessions_play_time_week
+sessions_play_time_month
+
+sessions_active_time_total
+sessions_active_time_day
+sessions_active_time_week
+sessions_active_time_month
+
+sessions_afk_time_total
+sessions_afk_time_day
+sessions_afk_time_week
+sessions_afk_time_month
+
+sessions_unique_players_total
+sessions_unique_players_day
+sessions_unique_players_week
+sessions_unique_players_month
+
+sessions_players_death_total
+sessions_players_death_day
+sessions_players_death_week
+sessions_players_death_month
+
+sessions_players_kill_total
+sessions_players_kill_day
+sessions_players_kill_week
+sessions_players_kill_month
+
+sessions_mob_kill_total
+sessions_mob_kill_day
+sessions_mob_kill_week
+sessions_mob_kill_month
+
+sessions_average_session_length_total
+sessions_average_session_length_day
+sessions_average_session_length_week
+sessions_average_session_length_month
+
+sessions_average_unique_players_total
+sessions_average_unique_players_day
+sessions_average_unique_players_week
+sessions_average_unique_players_month
+sessions_new_players_day
+sessions_new_players_week
+sessions_new_players_month
+
+ping_total
+ping_day
+ping_week
+ping_month
+
+sessions_peak_count
+sessions_peak_date
+
+sessions_recent_peak_count
+sessions_recent_peak_date
+```