Method addFiles

src/main/java/club/qqtim/command/Add.java:46–59

update the index file content: if new file then add while old file will be updated content is a big easy (key val directly) json like this: { ".\\doc\\OptionsAndParameters2.png": "f4a36c21ce890b0fa10067c10dab416e9b71a13e" }

(List<String> files)

     * }
     */
    private void addFiles(List<String> files) {
        final String indexContent = FileUtil.getFileAsString(ConstantVal.INDEX, ConstantVal.NONE);
        final JsonObject asJsonObject = new Gson().fromJson(indexContent, JsonObject.class);

        files.forEach(file  -> {
            final boolean isFile = FileUtil.isFile(file);
            if (isFile) {
                addFile(asJsonObject, file);
            } else { // is directory
                addDirectory(asJsonObject, file);
            }
        });
        FileUtil.createFile(asJsonObject.toString(), ConstantVal.INDEX);
    }

    private void addFile(JsonObject asJsonObject, String file) {
        HashObject hashObject = new HashObject();