README.md: add usage instructions

Create README.md

pageant: fix unicode mode

ci: remove matrix as we are building only for 64 bits windows

build with UNICODE enabled

ci: fix build with msbuild

.gitignore: add build* to ignored files

ci: add github actions to build automatically on push

cmake: add package target and versioning from git

ssh-agent: simplify code with c++

pageant: fix communication

format sources

add clang-format file

Initial commit