docs(README.md, .github): add community pages and add links to README (#2)

Author: emcarru

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,3 @@
+# Code of Conduct
+
+[You can read the Flynt Code of Conduct here](https://github.com/flyntwp/guidelines/blob/master/CODE_OF_CONDUCT.md).

.github/CONTRIBUTING.md

@@ -0,0 +1,3 @@
+# Contributing to the Flynt Docker Build
+
+Thank you for taking the time to contribute! Read the [Flynt Contributing Guidelines here](https://github.com/flyntwp/guidelines/blob/master/CONTRIBUTING.md).

README.md

@@ -32,9 +32,9 @@ docker run --rm -e UID=`id -u $USER` -e GID=`id -g $USER` -v /path/to/your/sourc
 
 ## Contribute
 
-PRs accepted.
+To contribute, please use GitHub [issues](https://github.com/flyntwp/docker-flynt-build/issues). Pull requests are accepted. Please also take a moment to read the [Contributing Guidelines](https://github.com/flyntwp/guidelines/blob/master/CONTRIBUTING.md) and [Code of Conduct](https://github.com/flyntwp/guidelines/blob/master/CODE_OF_CONDUCT.md).
 
-Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
 
 ## License