Add csysdig and atop (#373)

atop - root level system and process monitor for Linux
csysdig - root level Ncurses interface for sysdig

README.md

@@ -19,6 +19,7 @@
 
 - [AdGuardian-Term](https://github.com/lissy93/AdGuardian-Term) A TUI dashboard for monitoring real-time traffic from an AdGuard Home instance
 - [apachetop](https://github.com/tessus/apachetop) display information from a running copy of Apache.
+- [atop](https://github.com/Atoptool/atop/) root level system and process monitor for Linux
 - [bandwhich](https://github.com/imsnif/bandwhich) Terminal bandwidth utilization tool
 - [bashtop](https://github.com/aristocratos/bashtop) Resource manager written in bash
 - [below](https://github.com/facebookincubator/below) A time traveling resource monitor for modern Linux systems
@@ -32,6 +33,7 @@
 - [cheatshh](https://github.com/AnirudhG07/cheatshh) A fzf TUI for managing custom made command-line cheatsheet for Unix.
 - [cointop](https://github.com/miguelmota/cointop) The fastest and most interactive terminal based UI application for tracking cryptocurrencies
 - [CoreFreq](https://github.com/cyring/CoreFreq) CPU monitoring software designed for the 64-bits Processors
+- [csysdig](https://github.com/draios/sysdig) root level Ncurses interface for sysdig, Linux system exploration and troubleshooting tool with first class support for containers
 - [damon](https://github.com/hashicorp/damon) TUI interface for Hashicorp Nomad
 - [dashbrew](https://github.com/rasjonell/dashbrew) TUI dashboard builder that lets you visualize data from scripts and APIs.
 - [dolphie](https://github.com/charles-001/dolphie) Your single pane of glass for real-time analytics into MySQL/MariaDB & ProxySQL