Added stylesheet, demo docs etc.

BionxControl.qss

@@ -0,0 +1,29 @@
+/* app.qss */
+
+/* Alle QWidgets bekommen diesen Font */
+QWidget {
+    font-size: 14px;
+    font-family: "Segoe UI", sans-serif;
+}
+
+/* Spezifisches Styling für Buttons */
+QPushButton {
+    background-color: #0078d7;
+    color: white;
+    border-radius: 4px;
+    padding: 6px;
+}
+
+QPushButton:hover {
+    background-color: #1084e3;
+}
+
+QPushButton:pressed {
+    background-color: #005a9e;
+}
+
+/* Styling anhand von Objektnamen (ID) */
+#loginButton {
+    font-weight: bold;
+    background-color: green;
+}