Addition of the README and basic Groovy source samples.

- Addition of the README.txt file explaining what this repository is all about.
- Addition of Groovy sample source.
- Addition of sample resource Properties file.

README.txt

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+This is a sample project students can use during Matthew's Git class.
+
+We can have a bit of fun with this repo, knowing that we can always reset it to a known good state.  We can apply labels, and branch, then add new code and merge it in to the master branch.
+
+As a quick reminder, this came from one of three locations in either SSH, Git, or HTTPS format:
+
+* [email protected]:matthewmccullough/hellogitworld.git
+* git://github.com/matthewmccullough/hellogitworld.git
+* https://[email protected]/matthewmccullough/hellogitworld.git
+
+We can, as an example effort, even modify this README and change it as if it were source code for the purposes of the class.

resources/labels.properties

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+app.title=Our App
+app.welcome=Welcome to the application
+app.goodbye=We hope you enjoyed using our application
+cli.usage=This application doesn't use a command line interface

src/Main.groovy

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+def name = "Matthew"
+
+println "Hello ${name}"
+
+int programmingPoints = 10
+println "${name} has at least ${programmingPoints} programming points."