Update ToDo.txt

Add in priority 3 stuff.
Update README.md

Now who am I?
added sand
added stone
Update ToDo.txt
Update ToDo.txt
Added cobble!
Minerals
Minerals
Merge pull request #8 from NANOsoldierEnke/master

Minerals!
Leaves and wood!
Merge pull request #1 from realtinymonster/master

Test
Added Water

Static Water and Animated Source
New stuff
Buckets!
Merge branch 'master' of https://github.com/NANOsoldierEnke/gitpack-minetest
Merge pull request #9 from NANOsoldierEnke/master

buckets!
Update ToDo.txt
Update ToDo.txt
Desert stuff

Sand and stone!