Add initial project configuration and setup for Reference Board Viewer application. Include EditorConfig for consistent coding styles, pre-commit hooks for linting and formatting, Docker Compose for local development with PostgreSQL and MinIO, and a Nix flake for development environment management. Establish CI/CD pipeline for automated testing and deployment.

.editorconfig

@@ -0,0 +1,34 @@
+# EditorConfig for Reference Board Viewer
+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{js,jsx,ts,tsx,svelte}]
+indent_style = space
+indent_size = 2
+
+[*.{py}]
+indent_style = space
+indent_size = 4
+max_line_length = 100
+
+[*.{json,yaml,yml}]
+indent_style = space
+indent_size = 2
+
+[*.{md,markdown}]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
+
+[*.nix]
+indent_style = space
+indent_size = 2
+