Proposal: Adapt Multiple Type of Database for Harbor

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Basic structure

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feat: db proposal initial verion (#2)

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Signed-off-by: JinXingYoung <yvonnexyang@tencent.com>

README.md

@@ -19,6 +19,7 @@ Workgroup is a virtual team of aggregating the efforts of all the interested par
 |[Multi Architecture](https://github.com/goharbor/community/tree/master/workgroups/wg-multiarch)|The purpose of this working group is to enable Harbor to support multiple architectures, such as x86 arm.|ZhiPeng Yu@Alauda ([yuzp1996](https://github.com/yuzp1996))| Steven Zou@VMware ([steven-zou](https://github.com/steven-zou)) |[8 Members](https://github.com/goharbor/community/tree/master/workgroups/wg-multiarch#members)|
 |[Performance](https://github.com/goharbor/community/tree/master/workgroups/wg-performance)|The purpose of this work group is to improve the performance and scalability of harbor in the use case of large data volumes.|ChenYu Zhang@Alauda ([chlins](https://github.com/chlins))| Steven Zou@VMware ([steven-zou](https://github.com/steven-zou))/ Daniel Morinigo@Alauda ([danielfbm](https://github.com/danielfbm)) |[11 Members](https://github.com/goharbor/community/tree/master/workgroups/wg-performance#members)|
 |[Image Acceleration](https://github.com/goharbor/community/tree/master/workgroups/wg-image-accel)|The objective of this working group is to aggregate efforts to discuss, design and finally integrate accelerated container image format support in Harbor.|Bo Liu@AlibabaCloud ([liubogithub](https://github.com/liubogithub))|Steven Zou@VMware ([steven-zou](https://github.com/steven-zou))/Wang Yan@VMWare ([wy65701436](https://github.com/wy65701436))|[7 members](https://github.com/goharbor/community/tree/master/workgroups/wg-image-accel#members)|
+|[Databases](https://github.com/goharbor/community/tree/master/workgroups/wg-databases)|The objective of this working group is to aggregate efforts to support different databases in Harbor in addition to PostgreSQL.|Yvonne@Tencent[@JinXingYoung](https://github.com/JinXingYoung)|Yiyang Huang@ByteDance[@hyy0322](https://github.com/hyy0322)|[3 members](https://github.com/goharbor/community/tree/master/workgroups/wg-databases#members)|
 
 ## Structure