Basic build system, unit-testing, and Doxygen documentation.

[andrewcoughtrie]

Added a cmake build system along with googletest based unit-testing and doxygen documentation generation, only place holder source files at the moment.

[TeranIvy]

It is good to see a build system put in place. I have quite a few comments and suggestions, mainly requests for additional explanations and comments. I believe that the developer knows what each file/module is about, but not everybody may be on the same page 😄

I checked out the branch and built the tool as outlined. Everything works.

I took the liberty of creating a project Changelog and adding it directly to master, so I would kindly ask the developer to merge the master to the branch after addressing code review comments so I can add the commit-to-master message to changelog.

I also added initial development and code review documentation to the wiki, see the links: https://github.com/MetOffice/profiler/wiki

Re addressing changes, I would request prefixing the commits with the PR number as outlined in the development guidance: https://github.com/MetOffice/profiler/wiki/DevelopmentTesting

[TeranIvy]

Back to @andrewcoughtrie to address comments.

[andrewcoughtrie]

Made the changes requested so returning to @TeranIvy for another review.

[andrewcoughtrie]

Made the requested changes, back to @TeranIvy for another look.

[TeranIvy]

Almost there. There are a couple of style remarks (see inline).

I would also request that the created build directory be added to .gitignore. According to the instructions in the README.md, build is created in the root repo directory, so I think it is safe to assume that the users will do that, too.

[andrewcoughtrie]

Added the build directory to the .gitignore file, also tidied up how it ignores the .idea directory used by my IDE, not sure why it split everything before but it just ignores the whole directory now.

[andrewcoughtrie]

Back to @TeranIvy

[TeranIvy]

All well now. I updated a local working copy of the branch and rebuilt and retested the code. All fine.

Updated CHANGELOG.md for the merge to master. Proceeding to merge.