Start implementing Trello API service

Implement name of system to import
Implement need validate data
Fix allowed system list
Start implementing Trello API service

Signed-off-by: Vitor Mattos <vitor@php.rio>

lib/Service/fixtures/config-trelloApi-schema.json

@@ -0,0 +1,44 @@
+{
+    "type": "object",
+    "properties": {
+        "api": {
+            "type": "object",
+            "properties": {
+                "key": {
+                    "type": "string",
+                    "pattern": "^\\w{32}$"
+                },
+                "token": {
+                    "type": "string",
+                    "pattern": "^\\w{1,}$"
+                }
+            }
+        },
+        "boards": {
+            "type": "array",
+            "items": {
+                "type": "string",
+                "pattern": "^\\w{1,}$"
+            }
+        },
+        "uidRelation": {
+            "type": "object",
+            "comment": "Relationship between Trello and Nextcloud usernames",
+            "example": {
+                "johndoe": "admin"
+            }
+        },
+        "owner": {
+            "type": "string",
+            "required": true,
+            "comment": "Nextcloud owner username"
+        },
+        "color": {
+            "type": "string",
+            "required": true,
+            "pattern": "^[0-9a-fA-F]{6}$",
+            "comment": "Default color for the board. If you don't inform, the default color will be used.",
+            "default": "0800fd"
+        }
+    }
+}