3.0 update

Author: CyanoHao

README.md

@@ -9,4 +9,10 @@ Download: [releases page](https://github.com/cyano-linux/redpanda-cpp/releases).
     * x86-64 is built on CentOS 7, and should work on glibc-based Linux distributions since 2014.
     * AArch64 is built on Oracle Linux 7, and should work on glibc-based Linux distributions since 2014.
     * RISC-V RV64GC is built on Ubuntu 20.04, and should work on glibc-based Linux distributions since 2020.
-  * How to build: [upstream build instruction](https://github.com/royqh1979/RedPanda-CPP/blob/master/BUILD.md).
+* Statically-linked Deb
+  * x86-64 only.
+  * Intended for Ubuntu 20.04 (NOI Linux 2.0), but should work as long as dependencies are met.
+
+## How to Build
+
+[Upstream build instruction](https://github.com/royqh1979/RedPanda-CPP/blob/master/BUILD.md).