README Update: Describe how to properly install CustomTkInter on Conda (Anaconda/Miniconda)

[Arcitec]

There's around a million different open issues and discussions in your repo, where people are asking why CustomTkInter is pixelated and uses tiny fonts when running inside Conda.

For example, all of these duplicate tickets and many more: #2593 #1757 #1620 #1358 #1400 #1384 #1620 #1271 #931 ... and more!

I've investigated and found the answer: Conda installs tk into all environments by default, but uses a version built without support for FreeType/TrueType, font detection, Unicode or antialiasing. This is why the UI looks like total garbage inside Conda.

I have posted the solution in a comment on Conda's issue tracker. And you can add the same instructions to your readme/installation wiki (to hopefully reduce the amount of bug reports you're receiving about this):

https://github.com/conda-forge/tk-feedstock/pull/40#issuecomment-2381409555