feat: add converter, iupac-to-structure and structure-to-molfile (#64)

Author: lpatiny

docs/index.html

@@ -150,6 +150,12 @@
 </div>            
 
 
+<div class="preview" style="font-size: 12px">
+	<span class="preview_icon ci-icon ci-icon-chem-converter"></span>
+	<span>chem-converter</span>
+</div>            
+            
+
 <div class="preview" style="font-size: 12px">
 	<span class="preview_icon ci-icon ci-icon-chem-isomers"></span>
 	<span>chem-isomers</span>
@@ -168,6 +174,12 @@
 </div>            
 
 
+<div class="preview" style="font-size: 12px">
+	<span class="preview_icon ci-icon ci-icon-chem-iupac-to-structure"></span>
+	<span>chem-iupac-to-structure</span>
+</div>            
+            
+
 <div class="preview" style="font-size: 12px">
 	<span class="preview_icon ci-icon ci-icon-chem-mineral-formula-name"></span>
 	<span>chem-mineral-formula-name</span>
@@ -228,6 +240,12 @@
 </div>            
 
 
+<div class="preview" style="font-size: 12px">
+	<span class="preview_icon ci-icon ci-icon-chem-structure-to-molfile"></span>
+	<span>chem-structure-to-molfile</span>
+</div>            
+            
+
 <div class="preview" style="font-size: 12px">
 	<span class="preview_icon ci-icon ci-icon-cheminfo-sdf-table"></span>
 	<span>cheminfo-sdf-table</span>