Added nanorc for Dockerfiles

Signed-off-by: Matt Bentley <matt@docker.com>

contrib/syntax/nano/Dockerfile.nanorc

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+## Syntax highlighting for Dockerfiles
+syntax "Dockerfile" "Dockerfile[^/]*$"
+
+## Keywords
+icolor red "^(FROM|MAINTAINER|RUN|CMD|LABEL|EXPOSE|ENV|ADD|COPY|ENTRYPOINT|VOLUME|USER|WORKDIR|ONBUILD)[[:space:]]"
+
+## Brackets & parenthesis
+color brightgreen "(\(|\)|\[|\])"
+
+## Double ampersand
+color brightmagenta "&&"
+
+## Comments
+icolor cyan "^[[:space:]]*#.*$"
+
+## Blank space at EOL
+color ,green "[[:space:]]+$"
+
+## Strings, single-quoted
+color brightwhite "'([^']|(\\'))*'" "%[qw]\{[^}]*\}" "%[qw]\([^)]*\)" "%[qw]<[^>]*>" "%[qw]\[[^]]*\]" "%[qw]\$[^$]*\$" "%[qw]\^[^^]*\^" "%[qw]![^!]*!"
+
+## Strings, double-quoted
+color brightwhite ""([^"]|(\\"))*"" "%[QW]?\{[^}]*\}" "%[QW]?\([^)]*\)" "%[QW]?<[^>]*>" "%[QW]?\[[^]]*\]" "%[QW]?\$[^$]*\$" "%[QW]?\^[^^]*\^" "%[QW]?![^!]*!"
+
+## Single and double quotes
+color brightyellow "('|\")"

contrib/syntax/nano/README.md

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+Dockerfile.nanorc
+=================
+
+Dockerfile syntax highlighting for nano
+
+Single User Installation
+------------------------
+1. Create a nano syntax directory in your home directory:
+ * `mkdir -p ~/.nano/syntax`
+
+2. Copy `Dockerfile.nanorc` to` ~/.nano/syntax/`
+ * `cp Dockerfile.nanorc ~/.nano/syntax/`
+
+3. Add the following to your `~/.nanorc` to tell nano where to find the `Dockerfile.nanorc` file
+  ```
+## Dockerfile files
+include "~/.nano/syntax/Dockerfile.nanorc"
+  ```
+
+System Wide Installation
+------------------------
+1. Create a nano syntax directory: 
+  * `mkdir /usr/local/share/nano`
+
+2. Copy `Dockerfile.nanorc` to `/usr/local/share/nano`
+  * `cp Dockerfile.nanorc /usr/local/share/nano/`
+
+3. Add the following to your `/etc/nanorc`:
+  ```
+## Dockerfile files
+include "/usr/local/share/nano/Dockerfile.nanorc"
+  ```