locate CmakeLists.txt in root's subfolders

[elahehrashedi]

fix: #533

if there is no cmakelists in the root this will be shown:

Then you hit on "Locate",

in case there are few cmakelists files in subdirectories this will be shown:

in case there is no cmakelists file in the root this will be shown:

[bobbrow]

Submitted a few comments.