added hershey font test

plotter-app/test_hershey.py

@@ -0,0 +1,16 @@
+# Minimalistic code for easy start
+from HersheyFonts import HersheyFonts
+import matplotlib.pyplot as plt
+
+
+
+def draw_line(x1, y1, x2, y2):
+    plt.plot([x1,x2],[y1,y2])
+
+thefont = HersheyFonts()
+thefont.load_default_font()
+thefont.normalize_rendering(100)
+for (x1, y1), (x2, y2) in thefont.lines_for_text('Wallter is a wall plotter'):
+    draw_line(x1, y1 ,x2 ,y2)
+
+plt.show()