Created MySQL plugin (markdown)

MySQL-plugin.md

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+Connects to a given MySQL server and runs a selection of queries.
+
+### Example Configuration:
+
+```yaml
+build_settings:
+    mysql:
+        host: 'localhost'
+        user: 'testuser'
+        pass: '12345678'
+
+setup:
+    mysql:
+        - "CREATE DATABASE my_app_test;"
+
+complete:
+    mysql:
+        - "DROP DATABASE my_app_test;"
+```