Added a link to task 1.
Added a link to lecture 6 task 1.
Added link to lecure 6 task 2
Merge pull request #1 from paazmaya/master

added links to completed tasks
Merge pull request #123 from mpiivonen/master

Added a links to completed tasks
Merge pull request #124 from Markoham/master

Added task links
Clarification
Update task links
Switch to optional item
Merge pull request #125 from tariel/master

Update task links
Lecture 12 tasks added.
Lecture 10, task 3 done.
Merge pull request #126 from HeikkiAlanen/master

Lecture 12 tasks added. Lecture 10, task 3 done.
Forgot about tagging, #127
Add some of the missing assignments
Merge pull request #128 from olemstrom/master

Add some of the missing assignments etc
Added issue link
Merge pull request #129 from merilainen-metropolia/patch-2

Added issue link
Merge pull request #11 from paazmaya/master

Update
Update participation.md