feat: Added solution for 24_generics exercise (#153)

Co-authored-by: Kaushalya Pradeep <24698778+kaushalyap@users.noreply.github.com>

Author: bdeb1337

internal/exercises/solutions/24_generics/generics.go

@@ -0,0 +1,11 @@
+package generics
+
+// identity returns the argument, of any type, as is.
+func identity[T any](arg T) T {
+	return arg
+}
+
+// sumIntsOrFloats takes two arguments of the same type, either int or float64, and returns their sum.
+func sumIntsOrFloats[T int | float64](a, b T) T {
+	return a + b
+}