install openjdk14 on win10

procedure

1. download "openjdk-14_windows-x64_bin.zip" from https://jdk.java.net/14/
2. extract the zip file
3. set a "PATH" variable
   PATH="C:\path\to\jdk-14\bin"
4. execute "java -version" command to check

> java -version
openjdk version "14" 2020-03-17
OpenJDK Runtime Environment (build 14+36-1461)
OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)
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