feat(devcontainer): add Xilinx ISE development configuration

- Introduces a devcontainer setup for Xilinx ISE 14.7
- Configures remote user, workspace, and extensions
- Adds custom VS Code settings and post-start commands
- Improves development environment portability and consistency

.vscode/settings.json

@@ -0,0 +1,12 @@
+{
+    "workbench.colorCustomizations": {
+        "activityBar.activeBackground": "#d48282",
+        "activityBar.background": "#d48282",
+        "activityBar.foreground": "#15202b",
+        "activityBar.inactiveForeground": "#15202b99",
+        "activityBarBadge.background": "#b8e7b8",
+        "activityBarBadge.foreground": "#15202b"
+    },
+    "peacock.color": "#80d5e0",
+    "peacock.remoteColor": "#c75c5c"
+}