Adding .dockerignore file.

.dockerignore

@@ -0,0 +1,39 @@
+Dockerfile
+.dockerignore
+
+.git/
+**/*.py[cod]
+
+# Packages
+**/*.egg
+**/*.egg-info
+**/dist
+**/build
+**/__pycache__
+
+# Unit test / coverage reports
+**/.coverage
+**/.nox/
+**/.cache
+**/.pytest_cache
+
+# Mac
+**/.DS_Store
+
+# Generated files
+**/src/bezier/*.o
+**/src/bezier/quadpack/*.o
+**/src/bezier/_speedup*.so
+**/wheelhouse/
+**/scripts/macos/dist_wheels/
+**/scripts/macos/fixed_wheels/
+**/tests/fortran/*.gcda
+**/tests/fortran/*.gcno
+**/tests/fortran/*.o
+**/tests/fortran/*.mod
+**/tests/fortran/coverage.info
+**/tests/fortran/lcov-html/
+**/tests/fortran/unit-test-bin
+**/tests/fortran/unit-test-bin.dSYM/
+**/tests/fortran/functional-test-bin
+**/tests/fortran/functional-test-bin.dSYM/