added "Histogram maker" tool

Author: sergey-frolov-pm

.gitignore

@@ -6,5 +6,4 @@
 ~$*.xlsx
 ~$*.xlt
 ~$*.xltm
-~$*.xltx
-static/VBAfree.png
+~$*.xltx

README.md

@@ -2,11 +2,13 @@
 Excel tools and VBA snippets for focused business tasks
 
 ## Done:
-- [x] ["Multivalue cells" macro](https://github.com/sergey-frolov-pets/excel-helpers/tree/master/tools/multivalue_cells)- You can keep few values in one cell using special form
+- [x] ["Multivalue cells" macro](https://github.com/sergey-frolov-pets/excel-helpers/tree/master/tools/multivalue_cells)- You can keep few values in one cell using special form <img src="/static/vba.png" width="75">
 
-- [x] ["Friendly spam sender" tool](https://github.com/sergey-frolov-pets/excel-helpers/tree/master/tools/friendly_spam) - instrument to send personalized template-based emails to the list of recipients.
+- [x] ["Friendly spam sender" tool](https://github.com/sergey-frolov-pets/excel-helpers/tree/master/tools/friendly_spam) - instrument to send personalized template-based emails to the list of recipients. <img src="/static/vba.png" width="75">
+
+- [x] ["Histogram maker" tool](https://github.com/sergey-frolov-pets/excel-helpers/tree/master/tools/histogram_maker) - instrument for playing with data ranges to create nice-looking histogram charts <img src="/static/vba-free.png" width="75">
 
 ## Coming soon:
-- [ ] **Histogram maker tool** - instrument for playing with data ranges to create nice-looking histogram charts <img src="/static/vba-free.png" width="75">
 - [ ] **Dynamic GANTT charts tool** - yet another tool for creating Excel-based GANTT charts <img src="/static/vba-free.png" width="75">
-- [ ] ...
+- [ ] **Workbook accessor** - Snippets with wrappers to easy work with workbooks in VBA <img src="/static/snippets.png" width="75">
+- [ ] **Math and arrays** - Snippets with wrappers to easy work with arrays and some math operations in VBA <img src="/static/snippets.png" width="75">