Add missing dotnet modules

[digital88]

testcontainers/testcontainers-dotnet#1372

[digital88]

Logos are hard.

Firebird has logo as svg here https://www.firebirdsql.org/en/logos/ but they require explicit authorisation to use it.

JanusGraph has good logo here https://github.com/JanusGraph/logos/blob/master/RGB%20-%20SVG/JanusGraph%20logomark%20color%20RGB.svg but I don't know how to build this repo to get a preview on my machine. Logo seems to be bigger than 60x60 (as noted in readme), but svg can be easily resized.

Microsoft (Kusto) logos needs explicit permission: simple-icons/simple-icons#10019

Papercut has logos here https://github.com/ChangemakerStudios/Papercut-SMTP/blob/develop/graphics/ but not square svg sadly.

SFTP logo seems to not exist ?

[eddumelendez]

Thanks @digital88