YARN-10187. Removing hadoop-yarn-project/hadoop-yarn/README as it is …

[ashutoshcipher]

Description of PR

Removing hadoop-yarn-project/hadoop-yarn/README as it is no longer maintained.

• JIRA: YARN-10187

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	17m 57s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	shelldocs	0m 0s		Shelldocs was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	shadedclient	33m 35s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shellcheck	0m 1s		No new issues.
+1 💚	shadedclient	22m 12s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 45s		The patch does not generate ASF License warnings.
		76m 29s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4222/1/artifact/out/Dockerfile
GITHUB PR	#4222
Optional Tests	dupname asflicense codespell shellcheck shelldocs
uname	Linux 689eccd18cca 4.15.0-153-generic #160-Ubuntu SMP Thu Jul 29 06:54:29 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 3a547e2
Max. process+thread count	523 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn U: hadoop-yarn-project/hadoop-yarn
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4222/1/console
versions	git=2.25.1 maven=3.6.3 shellcheck=0.7.0
Powered by	Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org

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[ashutoshcipher]

@aajisaka - Can you please review this? Thanks.

[aajisaka]

Merged. Thank you @ashutoshcipher