Basic youtrack api

[LecrisUT]

Is it appropriate to implement pure issue tracker support here? If so I want to work on getting the basic api in place for youtrack. For reference, the API is published here.

It would help a lot if someone can point to the documentation of the basic/abstract class/methods that need to be derived to get things working.

[Half-Shot]

Hiya, thanks for taking an interest and sure I'd love to see this happen! We need a developer guide ideally but for now I'd adhoc you something here:

• You'll first want to start ingesting webhooks from YouTrack. The way to do that is to create a new webhook handling class (A good example is the Figma class. The code is responsible for handling incoming webhooks and turning those into message queue events.
• Once you have a router, you'll want to import it in the Webhooks code, which is as simple as these three lines
• You'll want to create a Connection for YouTrack. Again, Figma has a good example.
• Once you've done that, subscribe to your message queue events from Step 1 (https://github.com/matrix-org/matrix-hookshot/blob/main/src/Bridge.ts#L207) and bind an event to a handler function in your connection (https://github.com/matrix-org/matrix-hookshot/blob/main/src/Bridge.ts#L600-L604)
• You'll want to define a function in ConnectionManager to fetch your YouTrack connection instance based upon some information in the webhook event (this is how we effectively route an incoming webhook message to a room) https://github.com/matrix-org/matrix-hookshot/blob/main/src/ConnectionManager.ts#L223-L225
• Last but not least, ensure you've written up some config options by modifying the config class in https://github.com/matrix-org/matrix-hookshot/blob/main/src/Config/Config.ts#L421-L422. You can use https://github.com/matrix-org/matrix-hookshot/blob/main/src/Config/Defaults.ts to define some sample values too!

Once all of that is done, you should have a functional setup going. Please give me a shout if any of that isn't clear and feel free to contribute a draft PR, we're happy to feedback as you go.