Add DefGuard to VPN

[NerdvanaExplorer]

• [x] Your additions are Free software
• [x] Software you are submitting is not your own, unless you have a healthy ecosystem with a few contributors (which aren't your sock puppet accounts).
• [x] Submit one item per pull request. This eases reviewing and speeds up inclusion.
• [x] Format your submission as follows, where Demo and Clients are optional. Do not add a duplicate Source code link if it is the same as the main link. Keep the short description under 80 characters and use sentence case for it, even if the project's webpage or readme uses another capitalisation. Demo links should only be used for interactive demos, i.e. not video demonstrations.
  • DefGuard - True enterprise WireGuard MFA/2FA, under 250 characters, sentence case. (Source Code, Clients) Apache2 Rust
• [x] Additions are inserted preserving alphabetical order.
• [x] Additions are not already listed at awesome-selfhosted
• [x] The Language tag is the main server-side requirement for the software. Don't include frameworks or specific dialects.
• [x] You have searched the repository for any relevant issues or PRs, including closed ones.
• [x] Any category you are creating has the minimum requirement of 3 items.
• [x] Any software project you are adding to the list is actively maintained.
• [x] The pull request title is informative, unlike "Update README.md". Suggested titles: "Add aaa to bbb" for adding software aaa to section bbb, "Remove aaa from bbb" for removing, "Fix license for aaa", etc.

Please take some time to answer the following questions as best you can:

• Why is it awesome?

DefGuard provides true enterprise-level security for WireGuard VPN connections with integrated multi-factor and two-factor authentication options.

• Have you used it? For how long?

I have been using it for a few months.

• Is this in a personal or professional setup?

The setup is professional.

• How many devices/users/services/... do you manage with it?

I use DefGuard to manage over 2000 devices and users.

• Biggest pros/cons compared to other solutions?

The major advantage is the enhanced security with MFA/2FA, which is not commonly offered by other VPN solutions.

• Any other comments about your use case, things you've found excellent, limitations you've encountered... ?

[teon]

Hi there, I'm the founder of defguard.

@NerdvanaExplorer thank you for contributing and recognizing defguard.

@nodiscc @Technetium1 - is there anything I can help/explain to push forward the merge request - would be great to spread the word.