添加 ubuntu-jdk8.md

ubuntu-jdk8.md

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+下载解压安装包
+```
+cd /usr/local
+```
+```
+wget https://mirrors.huaweicloud.com/java/jdk/8u202-b08/jdk-8u202-linux-x64.tar.gz
+```
+```
+tar -zvxf jdk-8u202-linux-x64.tar.gz
+```
+
+配置环境变量
+```
+vim /etc/profile
+```
+
+复制粘贴
+```
+export JAVA_HOME=/usr/local/jdk1.8.0_202
+export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
+export PATH=$PATH:$JAVA_HOME/bin
+```
+
+刷新
+```
+source /etc/profile
+```
+
+验证
+```
+java -version
+```