Add .gitignore for build outputs#4

kolt-mcb wants to merge 1 commit intocodex/update-build-instructions-in-readme.mdkolt-mcb/fraglets-cpp:codex/update-build-instructions-in-readme.mdfrom

codex/add-build-directory-and-.o-to-.gitignorekolt-mcb/fraglets-cpp:codex/add-build-directory-and-.o-to-.gitignoreCopy head branch name to clipboard