Add methods IsInstalled() to determine whether the IExtension instanc…

[iDreamsOfGame]

…e is installed

[prankard]

Hey @cosmos53076, This looks good. But it's hard to tell the changes modified in the file due to the text editor you're using changed tabs to spaces as shown in the tab modified commit diff
I assume it's just the IsInstalled method and it looks good.

To clarify, currently you can install an extension twice currently and it will only install once.
However, thinking about it. It could come handy checking if a conflicting extension is installed to do something else.

Could you re-push just the code modified changes (not the entire files) I'll be happy to include it, or I'll re-write and push it at a later date when I have time.

[iDreamsOfGame]

Sorry, you mean I just need to push a code snippets? or something else? Maybe the file changed all beacause of I installed a plugin of CodeMaid in Visual Studio which will help me to format code automatically.

[iDreamsOfGame]

I made a new pull reuqest. I disabled the plugin CodeMaid to format code autocmatically. Seems change is clear.