Implement basic task matcher module

[begedin]

Problem

From #668 we need a very basic task matcher module.

We would require a module, for example, UserTaskMatcher with a &match_user/2

defmodule CodeCorps.UserTaskMatcher do
 @default_task_count
 def match_user(%CodeCorps.User{} = user, task_count // @default_task_count) do
 get_list_of_tasks_with_most_overlapping_skills(tasks_count) 
 end

 defp get_list_of_tasks_with_most_overlapping_skills(amount) do
 # implementation goes here. probably a simple query initially
 # join user skills and tasks skills, group and count by task, order by count
 # limit the number of results to amount
 end
end

Subtasks

• write described module
• write tests for it

References

• taken from Feature Checklist: Matching users with tasks #668

[ignu]

I'll grab this if no one else wants it. I should be able to get it done tomorrow.

[begedin]

@ignu, feel free to mark in progress and assign yourself