Created Docker (markdown)

Docker.md

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+# Docker
+
+## Summary
+These instructions will allow you run tbaMUD inside of a Docker container on your computer (any OS) with no manual configuration or additional software installation necessary. 
+
+- It will setup a Ubuntu 18.04 container running the game over port 4000. 
+- Any changes to your game code will require you to rebuild & restart the container.
+- Could improvements be made? Sure.
+- Could this be a bit cleaner or more efficient? You betcha.
+- I just wanted to get this out there so that it'd be even easier for folks who would like to see the game running, to be able to.
+
+## Requirements
+install Docker & docker-compose for whatever platform you wish to run as the game server.
+
+## Setup
+- edit the files to your liking
+- add Dockerfile & docker-compose.yaml to the base directory of the project (folder with /src).
+
+## Files
+
+### Dockerfile
+```shell
+FROM ubuntu:18.04
+
+# EXPOSE 4000
+
+# Set timezone
+ENV TZ="America/New_York"
+RUN date
+
+# Update and Install
+RUN apt update && apt upgrade -y
+RUN apt-get install -y automake make gcc g++ clang libtool autoconf zlib1g-dev libcurl4-openssl-dev wget build-essential vim telnet dos2unix
+
+# apt cleanup
+RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Setup App Area (COPY releative to Dcokerfile location...)
+RUN mkdir -p /app
+COPY . /app
+WORKDIR /app
+
+# Remove Windows CRLF & compile
+RUN find /app -type f -print0 | xargs -0 dos2unix --
+RUN chmod +x /app/configure && ./configure
+RUN cd /app/src && make all
+
+# Run tbamUD server
+ENTRYPOINT ["sh", "/app/autorun", "&"]
+
+# Debug Container
+# ENTRYPOINT ["tail", "-f", "/dev/null"]
+
+```
+
+### docker-compose.yaml
+```yaml
+services:
+  tbamud:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: tbamud_cn
+    # env_file:
+    #   - ./EXAMPLE.env
+    ports:
+      - 4001:4000
+    volumes:
+      - ./shared:/mnt/shared
+    environment:
+      - Key=Value
+```
+
+## Use
+
+### Startup
+- on CLI, change to base directory
+- docker-compose up -d
+- this will build the server image that the container will run, with all the dependencies needed to compile & run tbaMUD
+- then it will start the gameserver container
+
+### Shutdown
+- on CLI, change to base directory
+- docker-compose down
+- this will stop the game server container
+
+## Troubleshooting
+- ERR: I honestly do not see how this any error could occur if you have Docker running on your machine, except maybe a port conflict.
+  - Cause: is it plugged in?
+  - Remediation: plug it in.
+
+## References
+- [Docker 101](https://www.docker.com/101-tutorial/)