Update README.md

Author: mxssl

README.md

@@ -43,6 +43,9 @@ This repository is an attempt to consolidate useful resources for Site Reliabili
 
 - [ ] [Linux troubleshooting tools](https://syedali.net/2013/08/20/linux-troubleshooting-tools)
 - [ ] [Linux Performance Analysis in 60,000 Milliseconds](https://medium.com/netflix-techblog/linux-performance-analysis-in-60-000-milliseconds-accc10403c55)
+- [ ] [strace](https://www.dedoimedo.com/computers/strace.html)
+- [ ] [lsof](https://www.dedoimedo.com/computers/lsof.html)
+- [ ] [Linux system debugging](https://www.dedoimedo.com/computers/linux-system-debugging-super.html)
 
 ## Networking