Give pigz a pretty README

pigz/README.md

@@ -0,0 +1,17 @@
+# pigz
+
+[![Container source](https://img.shields.io/static/v1?label=Container%20Source&message=GitHub&color=lightgrey&logo=github&style=flat-square)](https://github.com/MillironX/singularity-builds/tree/master/pigz)
+[![pigz source](https://img.shields.io/static/v1?label=pigz%20Source&message=web&color=yellow&logo=linux&style=flat-square)](https://www.zlib.net/pigz/)
+[![Version v2.3.1](https://img.shields.io/static/v1?label=Latest%20version&message=v2.3.1&color=yellowgreen&logo=linuxcontainers&style=flat-square)](https://cloud.sylabs.io/library/millironx/default/pigz)
+[![Docs](https://img.shields.io/static/v1?label=Docs&message=man/PDF&color=blue&style=flat-square)](https://www.zlib.net/pigz/pigz.pdf)
+[![CentOS base](https://img.shields.io/static/v1?label=Base%20image&message=CentOS&color=9fcf32&logo=centos&style=flat-square)](https://www.centos.org/)
+
+pigz, which stands for parallel implementation of gzip, is a fully functional
+replacement for gzip that exploits multiple processors and multiple cores to the
+hilt when compressing data.
+
+## Tools installed
+
+### pigz
+
+- `pigz`