Tools setup

[dlaezza-jabra]

This PR sets up some development tools, namely:

• Updates .gitignore with relevant content from https://gitignore.io
  • I also added some ignored files to support my local flow (asdf and a .env files for the variables required to configure the VSCode C++ extension)
• Adds Linux setup to VSCode C++ extension
• Adds an .editorconfig file for white-space management in source code