feat(api): adding api server code

templater can be used as a commmand line tool or as an api server.

pkg/utils/main.go

@@ -0,0 +1,17 @@
+package utils
+
+import (
+	"github.com/hashicorp/hcl/v2"
+)
+
+func CheckErr(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func CheckDiags(diag hcl.Diagnostics) {
+	if diag.HasErrors() {
+		panic(diag.Error())
+	}
+}