add mockups to pflichtenheft

doc/mockup/import-window_mockup.json

@@ -0,0 +1,85 @@
+{
+    "mockup": {
+        "controls": {
+            "control": [
+                {
+                    "ID": "0",
+                    "typeID": "TitleWindow",
+                    "zOrder": "0",
+                    "w": "752",
+                    "measuredW": "450",
+                    "measuredH": "400",
+                    "x": "50",
+                    "y": "4",
+                    "properties": {
+                        "text": "TextureSync"
+                    }
+                },
+                {
+                    "ID": "1",
+                    "typeID": "Title",
+                    "zOrder": "1",
+                    "measuredW": "330",
+                    "measuredH": "44",
+                    "x": "261",
+                    "y": "99",
+                    "properties": {
+                        "text": "Textur hinzufügen"
+                    }
+                },
+                {
+                    "ID": "4",
+                    "typeID": "Label",
+                    "zOrder": "2",
+                    "measuredW": "30",
+                    "measuredH": "21",
+                    "x": "261",
+                    "y": "208",
+                    "properties": {
+                        "text": "Tags"
+                    }
+                },
+                {
+                    "ID": "6",
+                    "typeID": "TextInput",
+                    "zOrder": "3",
+                    "w": "330",
+                    "measuredW": "128",
+                    "measuredH": "27",
+                    "x": "261",
+                    "y": "225",
+                    "properties": {
+                        "text": "Holz, dunkel, Buche"
+                    }
+                },
+                {
+                    "ID": "7",
+                    "typeID": "TextInput",
+                    "zOrder": "4",
+                    "w": "218",
+                    "measuredW": "79",
+                    "measuredH": "27",
+                    "x": "261",
+                    "y": "165"
+                },
+                {
+                    "ID": "8",
+                    "typeID": "Button",
+                    "zOrder": "5",
+                    "measuredW": "97",
+                    "measuredH": "27",
+                    "x": "494",
+                    "y": "165",
+                    "properties": {
+                        "text": "Datei öffnen"
+                    }
+                }
+            ]
+        },
+        "mockupH": "400",
+        "mockupW": "752",
+        "measuredW": "802",
+        "measuredH": "404",
+        "version": "1.0"
+    }
+}