adding exposure3 module with QRF model

exposure3_module/templates/exposure3_index.html

@@ -81,7 +81,7 @@ Matrix: <select name="polymer" id="polymer" onchange="javascript:polymerCheck();
 Mass (g): <input name="mass" id="mass" step="any" value="1.0" min="0.000001" type="number" required> <br>
 Density (g/cm<sup>3</sup>): <input name="density" id="density" step="any" value="1.0" min="0.01" type="number" required>
 <span id="otherpolymer" style="visibility:hidden">
-<br>Glass transition temperature (&deg;C): <input name="polytg" id="polytg" step="any" min="-273.15" max="600" value="" type="number">
+<br>Glass transition temperature (&deg;C): <input name="polytg" id="polytg" step="any" min="-273.15" max="500" value="" type="number">
 </span>
 
 <!-- Modal -->
@@ -144,7 +144,6 @@ Density (g/cm<sup>3</sup>): <input name="density" id="density" step="any" value=
   </div>
 </div>
 
-
 <h3> Exposure assessment </h3>
 Click to screen your device: <button type="submit">Estimate exposure</button>