Created Database Schema Migrations (markdown)

Database-Schema-Migrations.md

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+# Adding New Required Schema Migrations
+
+* It's extremely simple
+* When you add your .sql file, you still will add it as traditionally
+    to our regular path
+  * `utils/sql/git/required` - [Github Link](https://github.com/EQEmu/Server/tree/master/utils/sql/git/required)
+
+# Changes in the Source
+
+* You need to increment a define in the source that dictates what database version the source SHOULD be running at
+  * Located in `common/version.h`
+
+The database version will need to match the manifest entry you have added, more on that in a moment
+
+`CURRENT_BINARY_DATABASE_VERSION = 9058`
+
+# The Manifest
+
+* The manifest is stored always on Github and contains all the definitions and logic for determining if a database needs to update
+  * `utils/sql/db_update_manifest.txt`
+  * [Manifest Link](https://github.com/EQEmu/Server/blob/master/utils/sql/db_update_manifest.txt)
+
+Add a line to the bottom of the file, it is going to look similar to the following
+
+```
+9058|2014_11_17_example_update_file.sql|SHOW TABLES LIKE 'character_mercenaries'|empty|
+```
+
+* This example would then have users run `2014_11_17_example_update_file.sql` when they don't have the 'character_mercenaries' table because of the empty condition
+
+* That's it! As far as what is needed from a developer to have the server run the migration, that is all you need to do
+
+# Other Manifest Examples:
+
+### Example 1 (Missing):
+
+```
+9056|2014_11_08_RaidMembers.sql|SHOW COLUMNS FROM `raid_members` LIKE 'groupid'|missing|unsigned
+```