Hadoop YARN/ YARN-10186 Changed README.txt to README.md for better readability

[Gituser143]

Due to use of txt files for readme, readability is compromised. Change readme.txt to Markdown for better readability.

[hadoop-yetus]

💔 -1 overall

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		_ trunk Compile Tests _
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		_ Patch Compile Tests _
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[hadoop-yetus]

💔 -1 overall

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[hadoop-yetus]

💔 -1 overall

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[hadoop-yetus]

🎊 +1 overall

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GITHUB PR	#1887
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[hadoop-yetus]

🎊 +1 overall

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[hadoop-yetus]

🎊 +1 overall

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