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Moved design notes from headers to ownf ile

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## High level
Description: Library providing a threading pool where you can add work on the fly. The number
of threads in the pool is adjustable when creating the pool. In most cases
this should equal the number of threads supported by your cpu.
For an example on how to use the threadpool, check the main.c file or just read
the documentation found in the README.md file.
In this header file a detailed overview of the functions and the threadpool's logical
scheme is presented in case you wish to tweak or alter something.
_______________________________________________________
/ \
| JOB QUEUE | job1 | job2 | job3 | job4 | .. |
| |
| threadpool | thread1 | thread2 | .. |
\_______________________________________________________/
Description: Jobs are added to the job queue. Once a thread in the pool
is idle, it is assigned with the first job from the queue(and
erased from the queue). It's each thread's job to read from
the queue serially(using lock) and executing each job
until the queue is empty.
Scheme:
thpool______ jobqueue____ ______
| | | | .----------->|_job0_| Newly added job
| | | rear ----------' |_job1_|
| jobqueue----------------->| | |_job2_|
| | | front ----------. |__..__|
|___________| |___________| '----------->|_jobn_| Job for thread to take
job0________
| |
| function---->
| |
| arg------->
| | job1________
| next-------------->| |
|___________| | |..
## Synchronisation
*Mutexes* and *binary semaphores* are the main tools to achieve synchronisation between threads.