added travis file and test script

tests/test.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+cd $1
+echo $(pwd)
+ls -la
+
+
+# remove main.pdf
+[ -f main.pdf ] && rm main.pdf || echo "continue without remove"
+
+# test if main.pdf is removed
+[ -f main.pdf ] && exit 1 || echo "continue building pdf output"
+
+
+# build pdf from source
+pdflatex main.tex
+
+# exit successfully if pdf present or with error if not present
+[ -f main.pdf ] && exit 0 || exit 1