support add and remove pinyin dictionary function

phrase/phrase_dict_add.go

@@ -14,7 +14,7 @@ var DictAdd = map[string]string{
 	"着重": "zhuó zhòng",
 }
 
-// AddDict adds a token into phrase dictionary.
+// AddDict add a token into phrase dictionary.
 func AddDict(text, py string) {
 	DictAdd[text] = py
 }

pinyin_dict_add.go

@@ -4,3 +4,13 @@ package gpy
 var PinyinDictAdd = map[int]string{
 	0: "",
 }
+
+// AddDict add a token into pinyin dictionary.
+func AddDict(text int, py string) {
+	PinyinDictAdd[text] = py
+}
+
+// Remove remove a token from pinyin dictionary.
+func Remove(text int) {
+	delete(PinyinDictAdd, text)
+}