Init (#17)

* add basic gitignore

* init go mod

* add semrel and badges

* add error pkg

* added config pkg

* added main cmd structure

* return error on file not found and added log ids and messages

* add todo for error_creator.go

internal/errors/invalid_argument_test.go

@@ -0,0 +1,33 @@
+package errors_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	caos_errs "github.com/caos/utils/errors"
+)
+
+func TestInvalidArgumentError(t *testing.T) {
+	var invalidArgumentError interface{}
+	invalidArgumentError = new(caos_errs.InvalidArgumentError)
+	_, ok := invalidArgumentError.(caos_errs.InvalidArgument)
+	assert.True(t, ok)
+}
+
+func TestThrowInvalidArgumentf(t *testing.T) {
+	err := caos_errs.ThrowInvalidArgumentf(nil, "id", "msg")
+	_, ok := err.(*caos_errs.InvalidArgumentError)
+	assert.True(t, ok)
+}
+
+func TestIsErrorInvalidArgument(t *testing.T) {
+	err := caos_errs.ThrowInvalidArgument(nil, "id", "msg")
+	ok := caos_errs.IsErrorInvalidArgument(err)
+	assert.True(t, ok)
+
+	err = errors.New("I am invalid!")
+	ok = caos_errs.IsErrorInvalidArgument(err)
+	assert.False(t, ok)
+}