feat(snippets): add various snippets for go-mode

snippets/go-mode/ie

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: if error
+# key: ife
+# --
+if err != nil {
+  return ${0:err}
+}

snippets/go-mode/lpd

@@ -0,0 +1,4 @@
+# name: log.Printf("[DEBUG] ...\n", ...)
+# key: lpd
+# --
+log.Printf("[DEBUG] $1\n"$2)$0

snippets/go-mode/lppd

@@ -0,0 +1,4 @@
+# name: log.Printf("[DEBUG] ...: %+v\n", ...)
+# key: lppd
+# --
+log.Printf("[DEBUG] $1: %+v\n", $1)$0

snippets/go-mode/tf

@@ -0,0 +1,18 @@
+# name: func TestName(t *testing.T) { tests := []struct{ ... } ... }
+# key: tf
+# --
+func Test${1:Name}(t *testing.T) {
+	tests := []struct {
+		name string
+		$0
+	}{
+		{
+			name: "",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			
+		})
+	}
+}

snippets/go-mode/tt

@@ -0,0 +1,11 @@
+# name: tests := []struct{ ... }
+# key: tt
+# --
+tests := []struct {
+	name string
+	$0
+}{
+	{
+		name: "",
+	},
+}