A reverse google image search gave me the result that it is a weed.
I wouldn't eat it.
This plant if probably a member of the Night Shade family of plants. Do NOT eat this plant until properly identified. Does the stem seem to have small/tiny spines or needles? If so, it is very probably an un-desirable weed.
It looks similar to Chenopodium album (Fat Hen, Lambs Quarters, White Goosefoot) which is an edible weed but please be sure of identification before eating :)
Check with your local extension agent for the exact type.
It is Nightshade. Deadly if eaten! Google - Solanum