Adds devcontainer configuration for Xilinx ISE

Introduces a devcontainer configuration to streamline the setup of a development environment for Xilinx ISE 14.7.

Configures a Docker image, necessary runtime arguments, VS Code extensions, terminal settings, and port forwarding. Simplifies onboarding and ensures a consistent environment for development.

.devcontainer/devcontainer.json

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+{
+  "name": "Xilinx ISE 14.7",
+  "image": "xilinx-ise:14.7",
+  "runArgs": [
+    "--privileged",
+    "--cap-add=SYS_ADMIN",
+    "--shm-size=2g"
+  ],
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "p2l2.vhdl-by-hgb",
+        "eamodio.gitlens"
+      ],
+      "settings": {
+        "terminal.integrated.defaultProfile.linux": "bash"
+      }
+    }
+  },
+  "remoteUser": "xilinx",
+  "workspaceMount": "source=${localWorkspaceFolder},target=/workspaces/${localWorkspaceFolderBasename},type=bind",
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  "features": {},
+  "forwardPorts": [10000]
+}

.gitignore

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+.locale/
+.history/

.gitmodules

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+[submodule "build"]
+	path = build
+	url = https://git.0xmax42.io/maxp/Xilinx-ISE-Build.git