Expand README with motivation and implementation sections

Added sections on motivation and implementation details to provide context and understanding of the project.

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 # SchroederReverb
 A lightweight cross-platform VST3 reverb plugin written in C++ with the JUCE framework
 
+## My motivation
+I'm rather new to digital audio, but as a tinkerer of course my first thought was: "How can I make this myself?"
+Reverb seemed simple enough to understand, so I implemented this Schroeder reverberator.
+This is my first real C++ project and I was also able to learn the basics of CMake and the JUCE framework along the way.
+
+## Implementation
+The Schroeder reverberator works by first feeding the signal into four parallel comb filters.
+After that the result is sent through two all-pass filters in a row.
+
+I added UI knobs in order to change Dry/Wet mix, Pre-Delay and Decay easily.
+
 ## Dependencies
 - [CMake](https://cmake.org)
 - pkg-config