added dockerfile and docker-compose cheat sheet entries

blog/src/docker/docker-compose.md

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+# Dockerfile Cheat Sheet
+
+Coming soon...

blog/src/docker/dockerfile.md

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+# Dockerfile Cheat Sheet
+
+## Starting Point
+
+Arguments that dictate what to use as a starting point for the dockerfile
+
+### FROM
+
+Specifies what image to use as a base
+
+Usage:
+```
+FROM <image>
+FROM <image>:<tag>
+FROM <image>@<digest>
+```
+Notes:
+- **From is a required argument, and must come first**
+- If no tag is specified, the "latest" tag will be used
+
+
+## Metadata
+
+Arguments that don't affect how the image builds or container runs, but give information about the image
+
+### MAINTAINER
+
+Allows you to specify an author
+
+Usage:
+```
+MAINTAINER <name>
+```
+
+## Setup
+
+### ENV
+
+
+### ADD
+
+
+### WORKDIR
+
+### SHELL
+
+Command to change the shell that RUN uses
+
+Usage:
+```
+SHELL ["<cmd>", "<arg1>", "<arg2>", ...]
+```
+Notes:
+- Only changes shell for following RUN commands, you can switch between shells if you so desire
+
+
+## Build
+
+### RUN
+
+Command to run in order to build the image
+
+Usage:
+```
+RUN <cmd>
+RUN ["<cmd>", "<arg1>", "<arg2>", ...]
+```
+
+Notes:
+- The build will fail if a run command returns a non-zero code
+- Runs with the "default shell" (can be changed with the SHELL command)
+
+
+
+### CMD
+
+
+### 
+
+## Running
+
+### EXPOSE
+
+
+