!3 增加关于软件包的使用说明

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# pbzip2
#### 介绍
pbzip2是基于bzip2发行的多线程版本压缩比与bzip2大致相同但压缩时间上比bzip2减少了线程倍数
这是因为bzip2是单线程工作而bpzip2是多线程的
pbzip2的输出压缩文件兼容bzip2 v1.0.2以及更新的版本pbzip2压缩的压缩包可用bzip2进行解压缩
#### 软件架构
软件架构说明
#### 安装教程
1.在欧拉操作系统下,可通过运行如下命令进行安装:
> dnf install pbzip2
#### 使用说明
````
Usage: pbzip2 [-1 .. -9] [-b#cdfhklm#p#qrS#tVz] <filename> <filename2> <filenameN>
-1 .. -9 set BWT block size to 100k .. 900k (default 900k)
-b# Block size in 100k steps (default 9 = 900k)
-c,--stdout Output to standard out (stdout)
-d,--decompress Decompress file
-f,--force Overwrite existing output file
-h,--help Print this help message
-k,--keep Keep input file, don't delete
-l,--loadavg Load average determines max number processors to use
-m# Maximum memory usage in 1MB steps (default 100 = 100MB)
-p# Number of processors to use (default: autodetect [1])
-q,--quiet Quiet mode (default)
-r,--read Read entire input file into RAM and split between processors
-S# Child thread stack size in 1KB steps (default stack size if unspecified)
-t,--test Test compressed file integrity
-v,--verbose Verbose mode
-V,--version Display version info for pbzip2 then exit
-z,--compress Compress file (default)
--ignore-trailing-garbage=# Ignore trailing garbage flag (1 - ignored; 0 - forbidden)
If no file names are given, pbzip2 compresses or decompresses from standard input to standard output.
Example: pbzip2 -b15vk myfile.tar
Example: pbzip2 -p4 -r -5 myfile.tar second*.txt
Example: tar cf myfile.tar.bz2 --use-compress-prog=pbzip2 dir_to_compress/
Example: pbzip2 -d -m500 myfile.tar.bz2
Example: pbzip2 -dc myfile.tar.bz2 | tar x
Example: pbzip2 -c < myfile.txt > myfile.txt.bz2
````
#### 参与贡献
1. Fork 本仓库
2. 新建 Feat_xxx 分支
3. 提交代码
4. 新建 Pull Request
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2. 码云官方博客 [blog.gitee.com](https://blog.gitee.com)
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5. 码云官方提供的使用手册 [https://gitee.com/help](https://gitee.com/help)
6. 码云封面人物是一档用来展示码云会员风采的栏目 [https://gitee.com/gitee-stars/](https://gitee.com/gitee-stars/)