Add spectrometer

Edit the logic so we dont just create pictures which we mash together
but instead use stream for better implementation

Cargo.toml

@@ -28,6 +28,9 @@ clap = { version = "4.4", features = ["derive"] }
 # Error handling
 anyhow = "1.0"
 
+# FFT processing for spectrometer
+rustfft = "6.1"
+
 [profile.release]
 opt-level = 3
 lto = true