Added temp-conversion exercise

temp-conversion/go.mod

@@ -0,0 +1,3 @@
+module temp-conversion
+
+go 1.21.6

temp-conversion/main.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+var cel float64
+var fah float64
+
+func main() {
+	fmt.Println("Celsius to Fahrenheit converter")
+	fmt.Println("Write a temperature in celsius")
+	fmt.Scan(&cel)
+	celsiusToFahrenheit(cel)
+	fmt.Printf("%v degrees Celsius are equivallent to %v degrees Fahrenheit\n", cel, fah)
+}
+
+func celsiusToFahrenheit(cel float64) {
+	fah = cel*1.8 + 32
+	return
+}