Adding configurations docs

docs/configuration/backup/files.md

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+# Files backup configuration
+
+ ## JSON
+```
+"Files": {
+  "files": [
+    "/path/to/file1",
+    "/path/to/file2"
+  ]
+}
+```
+ ## General 
+File path should be absolute
+ 
+ ## Options
+files (mandatory)     = array of file paths

docs/configuration/backup/mysql.md

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+# Mysql backup configuration
+
+ ## JSON
+```
+"Mysql": {
+  "host"  : "mysql address",
+  "login" : "mysql login",
+  "pwd"   : "mysql password",
+  "db"    : "mysql database",
+  "tables": [
+    ""
+  ]
+}
+```
+ ## General 
+You can indicate "*" or nothing into tables to save every tables in the selected database.
+ 
+ ## Options
+host (mandatory)     = mysql host
+login (mandatory)    = mysql login
+pwd (mandatory)      = mysql password
+db (mandatory)       = database where the tables you want to save are in.
+tables (mandatory)   = array of tables
+
+