Added Proxy support

[SuhasDissa]

Hey there!

I really like your app, but unfortunately I've had to use it with a VPN because YouTube Music isn't supported in my country. I thought it would be helpful to add proxy support to your app, so I did! I hope you like it.

I tested it out and everything seems to be working properly.
I added a settings item to edit proxy settings, but it's not the most elegant thing ever 😅.
I'll work on improving it in the future.

[vfsfitvnm]

Thanks for this valuable PR!

ViMusic needs a severe rewrite and redesign (in all three UI, UX and SW), and unfortunately I'm not planning to do it anytime soon.
I don't feel confident in adding a new feature and release a new version out of the blue; and as a single developer, it's unlikely I will merge this PR for now, I apologize.

At least, people who absolutely need this feature can build the app themselves.

I'm going to do a blind-review to your changes anyway, you dedicated effort and time in that, and, sadly, a review is the only "reward" I can offer.

[SuhasDissa]

No worries. I also believe that a redesign is a good idea.
Thanks for your review. And also for this great app. 😃

[SuhasDissa]

If you want me to fix the typos then I can do it before any merging

[SuhasDissa]

Here are some screenshots for reference

[royal-crisis]

@SuhasDissa would you mind sharing your build i.e APK file

[SuhasDissa]

Hi there!

I'm sorry to say that I don't have the original key file to build a signed APK. This means that I can only build debug APKs, which are not suitable for release.

I don't want to redistribute this app with my own signature without vfsfitvnm's permission.

I hope you understand.
Thanks.