[12750] Added sql folder informative descriptions

sql/README.md

@@ -0,0 +1,31 @@
+-- FOLDERS:
+updates - contains updates for characters, mangos and realmd databases.
+
+tools - contains additional useful queries.
+
+-- SQL QUERIES:
+characters.sql - creates database in MySQL/PostgreSQL, which holds important every player character data.
+
+create_mysql.sql - creates initial databases structure for MaNGOS server in MySQL server. 
+This query will create three databases: "characters" (its characters database), "mangos" (its world database) and "realmd" (its accounts database)
+ databases. Also will created new MySQL user - "mangos", which is default in MaNGOS server.
+
+drop_mysql.sql - drops "characters", "realmd", "mangos" databases and user, created by create_mysql.sql query (if exists in MySQL server).
+
+mangos.sql - creates empty world database. Mostly used by developers, to coordinate basic world database structure.
+
+mangos_spell_check.sql - contain expected by code spell properties from simple existence to spell family mask and icons.
+This data let easy detect spell properties change at client version support switch and update or drop problematic code associated with checked 
+spell data. Sql file not required for server work but expected to be applied to MaNGOS DB if you plan use .debug spellcheck command in console.           */
+
+postgre_compatibility_addon.sql - contains queries for PostgreSQL users. Its need apply single time after DB creating or later (safe reapply) and let 
+correctly execute SQL queries with UNIX_TIMESTAMP/FROM_UNIXTIME functions uses in mangos/realmd code.
+
+realmd.sql - creates database in MySQL/PostgreSQL, which holds player game account information.
+NOTE: for testing purposes, this sql query contains four accounts data by default:
+        * username: ADMINISTRATOR password: ADMINISTRATOR, security level 3, has almost all administrator features.
+        * username: GAMEMASTER password: GAMEMASTER, security level is 2, has limited access.
+        * username: MODERATOR password: MODERATOR, security level is 1, has moderator access features (chat, tickets...).
+        * username: PLAYER password: PLAYER, security level is 0, its simple player account, has no access to gm commands.
+If still want to use clear realmd database, make sure, that on these accounts there wasn't created any characters, if is, truncate or reimport
+characters.sql and execute all these queries on realmd database - "truncate table account; truncate table realmcharacters;" (without quates).

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "12749"
+ #define REVISION_NR "12750"
 #endif // __REVISION_NR_H__