eina: add an example to demonstrate different eina insert and sort functions.

eina: add an example to demonstrate different eina insert and sort functions.

Summary:
While going through eina for understanding, wrote  a program to understand
he differences between different eina inarray functions. Thought, this might
be useful for others too, so adding the same.

Signed-off-by: Srivardhan Hebbar <sri.hebbar@samsung.com>
Reviewers: devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1803

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>