Add Gravity Tests (#3171)

Author: rzuckerm

archive/g/gravity/README.md

@@ -55,18 +55,10 @@ The following list contains all of the approved programs that are not currently
 
 ## Testing
 
-This language currently does not feature testing. If you'd like to help in the efforts to test all of the code in this repo, consider creating a testinfo.yml file with the following information:
+The following list shares details about what we're using to test all Sample Programs in Gravity.
 
-```yml
-folder:
-  extension:
-  naming:
-
-container:
-  image:
-  tag:
-  cmd:
-```
+- Docker Image: rzuckerm/gravity
+- Docker Tag: 0.8.5-1
 
 See the [Glotter2 project](https://github.com/rzuckerm/glotter2) for more information on how to create a testinfo file.
 

archive/g/gravity/testinfo.yml

@@ -0,0 +1,8 @@
+folder:
+  extension: ".gravity"
+  naming: "hyphen"
+
+container:
+  image: "rzuckerm/gravity"
+  tag: "0.8.5-1"
+  cmd: "gravity -q {{ source.name }}{{ source.extension }}"