added mockup for the startup window

doc/mockup/startup-window_mockup.json

@@ -0,0 +1,87 @@
+{
+    "mockup": {
+        "controls": {
+            "control": [
+                {
+                    "ID": "0",
+                    "typeID": "TitleWindow",
+                    "zOrder": "0",
+                    "w": "752",
+                    "measuredW": "450",
+                    "measuredH": "400",
+                    "x": "50",
+                    "y": "50",
+                    "properties": {
+                        "text": "TextureSync"
+                    }
+                },
+                {
+                    "ID": "1",
+                    "typeID": "Title",
+                    "zOrder": "1",
+                    "measuredW": "207",
+                    "measuredH": "44",
+                    "x": "317",
+                    "y": "102",
+                    "properties": {
+                        "text": "Verbinden..."
+                    }
+                },
+                {
+                    "ID": "2",
+                    "typeID": "Icon",
+                    "zOrder": "2",
+                    "measuredW": "48",
+                    "measuredH": "48",
+                    "x": "390",
+                    "y": "184",
+                    "properties": {
+                        "icon": {
+                            "ID": "spinner",
+                            "size": "large"
+                        }
+                    }
+                },
+                {
+                    "ID": "3",
+                    "typeID": "TextInput",
+                    "zOrder": "3",
+                    "w": "180",
+                    "measuredW": "79",
+                    "measuredH": "27",
+                    "x": "324",
+                    "y": "283"
+                },
+                {
+                    "ID": "4",
+                    "typeID": "Label",
+                    "zOrder": "4",
+                    "measuredW": "55",
+                    "measuredH": "21",
+                    "x": "386",
+                    "y": "262",
+                    "properties": {
+                        "text": "Server-IP"
+                    }
+                },
+                {
+                    "ID": "5",
+                    "typeID": "Button",
+                    "zOrder": "5",
+                    "measuredW": "130",
+                    "measuredH": "27",
+                    "x": "349",
+                    "y": "318",
+                    "properties": {
+                        "text": "Manuell Verbinden"
+                    }
+                }
+            ]
+        },
+        "mockupH": "400",
+        "mockupW": "752",
+        "measuredW": "802",
+        "measuredH": "450",
+        "version": "1.0"
+    }
+}