Created an adder function and implented a test.

I also learned about how to use the example functionality to test code.
Finally, I learned about godocs and how to make my own!

Integers/adder.go

@@ -0,0 +1,6 @@
+package integers
+
+// Add takes two integers and returns the sum of them.
+func Add(x, y int) int {
+	return x + y
+}

Integers/adder_test.go

@@ -0,0 +1,24 @@
+package integers //using the package integers to group all of the integer manipulation functions together
+//packages should be lowercase because there are still OS' that can't deal with mixed cases lol
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestAdder(t *testing.T) {
+	sum := Add(2, 2)
+	expected := 4
+	if sum != expected {
+		t.Errorf("expected '%d' but got '%d'", expected, sum)
+	}
+}
+
+// You can have Examples as part of the test suite
+// if you wanted to see which tests are being executed use the -v tag
+// Examples won't run without the //Output: 6 comment
+func ExampleAdd() {
+	sum := Add(1, 5)
+	fmt.Println(sum)
+	//Output: 6
+}

go.mod

@@ -1,3 +1,10 @@
 module hello
 
 go 1.20
+
+require (
+	github.com/yuin/goldmark v1.4.13 // indirect
+	golang.org/x/mod v0.10.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/tools v0.9.1 // indirect
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/yuin/goldmark v1.4.13 h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
+golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/tools v0.9.1 h1:8WMNJAz3zrtPmnYC7ISf5dEn3MT0gY7jBJfw27yrrLo=
+golang.org/x/tools v0.9.1/go.mod h1:owI94Op576fPu3cIGQeHs3joujW/2Oc6MtlxbF5dfNc=