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
+
+

docs/configuration/transport/email.md

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+# Email transport configuration
+
+ ## JSON
+```
+"Email": {
+  "to"        : "recipient@example.net;recipient2@example.net",
+  "from"      : "<name>from@example.net",
+  "encoding"  : "UTF-8",
+  "subject"   : "[Example.net] backup of the day",
+  "message"   : "Hi,\n\nYou can find your backup in this mail.\n\nRegards,\nMyself."
+}
+```
+ ## General 
+Emails are formated like this "email@domain.com" or like this "<name>email@domain.com"
+ 
+ ## Options
+to (mandatory)     = email addresses you want to send the backup to. Separated by semi-colon if more than one
+from (mandatory)   = person who send the backup by email.
+encoding           = email text encoding. Should stay with "UTF-8" or removed.
+subject (mandatory)= email subject
+message (mandatory)= email content sent as txt 

docs/configuration/transport/ftp.md

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+# FTP transport configuration
+
+ ## JSON
+```
+"Ftp": {
+  "host"      : "ftp.domain.com",
+  "login"     : "login",
+  "password"  : "password",
+  "folder"    : "/folder"
+},
+```
+ ## General 
+-
+ 
+ ## Options
+host (mandatory)   = ftp host without schema ("ftp://")
+login              = ftp login (mandatory if not anonymous)
+password           = ftp password (mandatory if not anonymous)
+folder             = the folder you want to put the backup in. If not set, the backup will be put in the ftp root
+
+