Add .gitignore

[cxw42]

Thank you for this project, which I have just started using and which seems very useful! I noticed that compiling md4c dirties the Git repo, so I added a .gitignore file. I submit it here in hopes it will be helpful to you or others. Thanks for considering this PR!

Note on sources: the .gitignore is mostly the GitHub C gitignore. I have added some lines for autotools, since I am using autotools to build a project that uses md4c as a submodule.

Notes on contents: Makefile is ignored. I think this is OK since you are using CMake instead of make, but I am happy to change it if you prefer. I can also add /build/ if you want that, since that's the CMake build dir for Travis.

Please let me know if you have any questions or comments. Thank you!

[codecov[bot]]

Codecov Report

Merging #119 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   94.31%   94.31%           
=======================================
  Files           3        3           
  Lines        3060     3060           
=======================================
  Hits         2886     2886           
  Misses        174      174           

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[mity]

Notes on contents: Makefile is ignored. I think this is OK since you are using CMake instead of make, but I am happy to change it if you prefer.

That's ok, as Makefile is generated (if people use the CMake's make generator).

I can also add /build/ if you want that, since that's the CMake build dir for Travis.

I don't think Travis cares so I'm indifferent. It can always be added later when a need arises.

[mity]

Merged. Thanks.

[cxw42]

Thanks very much for the quick review and approval!