Build System: Added automatic build file

You need to define main/0 where you compute the solution and
you also print it. For example:

  main :- compute(input, Solution), writef('%t\n', [Solution]).

Then, while inside the Prolog file, just hit Ctrl+B to run
automatic build.

Signed-off-by: Iulius Curt <iulius.curt@gmail.com>

Prolog.sublime-build

@@ -0,0 +1,6 @@
+{
+	"cmd": ["swipl", "-f", "$file_name", "-t", "main", "--quiet"],
+	"working_dir": "$file_path",
+	"file_regex": "^Warning: (.+):([0-9]+)",
+	"selector": "source.prolog"
+}