Add README.md

.gitignore

@@ -1 +1,2 @@
 .mypy*
+tests/out/*

README.md

@@ -0,0 +1,15 @@
+# Build Docker Image
+
+```
+docker build --build-arg UID=$(id -u) \
+             --build-arg GID=$(id -g) \
+             -t meshmerger .
+```
+
+# Run Docker Image
+
+```
+docker run -it \
+           -v /input:$(pwd)/tests/test_data:ro \
+           -v /output:$(pwd)/tests/out:rw meshmerger
+```