Made all the examples working. Added binomial tree vega analysis pluto. Remade folder structure in src.

Author: Combi, A (Alessandro)

Project.toml

@@ -9,13 +9,15 @@ BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
+Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 
 [compat]
 Accessors = "0.1.42"
 BenchmarkTools = "1.6.0"
 Dates = "1.11.0"
 Distributions = "0.25.117"
 ForwardDiff = "0.10.38"
+Plots = "1.40.10"
 julia = "1.11"
 
 [extras]