Create BUILD.md

BUILD.md

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+# How to build the project
+
+## Docker
+
+Building with Docker is super easy.
+
+```shell
+docker build -f Dockerfile . -t name, organization, or whatever you like < your > /acars_router:test
+```
+
+And the project should build with no issues.
+
+## Building acars_router from source
+
+If you desire to build `acars_router` from source, ensure you have [rust](https://www.rust-lang.org/tools/install) installed and up to date. `acars_router` build target is always the most recent Rust version, so you should not have to roll back to previous versions to get it built.
+
+Once you clone the repository and enter the repo's directory using a shell...
+
+Debugging:
+
+```shell
+cargo build
+```
+
+Release
+
+```shell
+cargo build --release
+```
+
+To run the project using cargo (useful for debugging):
+
+```shell
+
+cargo run -- <command line flags here>
+```
+
+Or you can directly run/find the binary in the `target` directory.