Update Readme.md

Readme.md

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-- [中文](ReadmeCN.md)
-
-### Using method ###
-
-Click to open KNZ_Convert_en_us_ver_1.2.1.exe of english version.
-
-Click "Single file convert" or "Batch files convert", input the RINEX file of version of 2.10 or 2.11.
-
-If not click the output diectory, the converted file will generate at the same directory of original file, 
-the file name of converted file is "COV-{originalfilename}"
-
-The converted file will note the version of convert at the heder of file.
-
-The converted file own some traits as below:
-
-1. Conversion does not require additional parameter information,
-the file is lossless conversion, only convert the foemat,
-do not modify the information. 
-2. The double character observation types of RINEX2.xx version will be automatically matched according to the following table:
-
-### Update brief ###
-2024/11/14: At present, the RINEX2.xx format conversion has been fully supported,
-the format output error of the previous version has been modified,
-and the conversion from 2.xx to 3.xx is currently supported.
-
-2024/11/15: Correct the output format, omit the empty observation and change the
-rule of match.
-
-2024/11/17: Fully support the conversion of RINEX 2.xx & RINEX 3.xx, also support
-the conversion of same major version.
-
-### Update plan ###
-1. 2.xx and 3.xx versions are fully supported, and support mutual conversion.
-2. Gradually introduce the conversion support for RTCM files.
-3. Long-term goal: receiver raw data conversion
+[English](Readme.md) | [中文](ReadmeCN.md)