Update README.md

Author: gpersoon

README.md

@@ -7,6 +7,9 @@ See video's here:
 - [KOIOS Online](https://www.koios.online)
 - [Youtube playlist Programming Dapps](https://www.youtube.com/playlist?list=PL89JtHJSeieVbSuXmZ7WYquDnkjJ-Ythi)
 
+See sheets here:
+- - [Programming dapps sheets](../../../dapps_sheets/)
+
 See examples here:
 - [ethereum examples](../../../ethereum/)
 - [ipfs examples](../../../ipfs/)