Add complete GIS ETL project skeleton for SRTM data processing

- Python modules for geo boundary processing and SRTM downloads
- Docker containerization with GDAL support
- Development environment with devcontainer
- Orchestration scripts for local and containerized execution
- Support for KMZ/GeoJSON boundary files and NASA SRTM data

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+{
+    "name": "GIS ETL Development",
+    "image": "mcr.microsoft.com/devcontainers/python:3.11-bullseye",
+    "features": {
+        "ghcr.io/devcontainers/features/git:1": {},
+        "ghcr.io/devcontainers/features/github-cli:1": {}
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-python.python",
+                "ms-python.flake8",
+                "ms-python.black-formatter",
+                "redhat.vscode-yaml"
+            ]
+        }
+    },
+    "postCreateCommand": "pip install -r requirements.txt",
+    "remoteUser": "vscode",
+    "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind",
+    "workspaceFolder": "/workspace"
+}