Adds recipe for reading Gzip-compressed files
Updates reading-gzipped-file recipe to note other stream options
Updates reading-gzipped-file recipe to add newline at end
Adds "Basics" chapter

Adds a chapter for absolute basics: getting, installing, running
Clojure, writing source code, using Leiningen.
Revises reading-gzipped-file recipe to include writing too
Renames reading-gzipped-file -> read-write-gzip
Adds newline to end of read-write-gzip
Update read-write-gzip.asciidoc

Changes "need" to "want", per standard Cookbook style
Updates CONTRIBUTING.md to expand on problem statement style
Updates CONTRIBUTING.md to expand on solution writing style
Updates CONTRIBUTING.md to explain use of admonitions
Updates CONTRIBUTING.md to refer contributors to other Cookbook titles for guidance
Adds recipe for exploring Clojure
Merge pull request #79 from jcromartie/contributing

Contributing
Merge pull request #78 from jcromartie/basics

Adds "Basics" chapter
Merge #66
Add cross-references for read-write-gzip