Create README.md

README.md

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+# rexec
+Parallel SSH executor in Rust. Read hosts from `known_hosts`
+```
+[ab@test debug]$ ./rexec -k admin-gce-sc.* --help
+Usage: rexec [OPTIONS] --kh <KNOWN_HOSTS> --command <COMMAND>
+
+Options:
+  -u, --username <USERNAME>  [default: ab]
+  -k, --kh <KNOWN_HOSTS>     Use known_hosts to build servers list
+  -c, --command <COMMAND>    Command to execute on servers
+      --code                 Show exit code ONLY
+      --noconfirm            Don't ask for confirmation
+  -p, --parallel <PARALLEL>  [default: 100]
+  -h, --help                 Print help
+  -V, --version              Print version
+  
+  
+[ab@test debug]$ ./rexec -k admin-gce-sc.* -c uptime -u ab 
+[INFO ] Matched hosts:
+[INFO ] admin-gce-sc-1.lca-prod.** [35.211.27.195]
+[INFO ] admin-gce-sc-1.mmk-prod.** [35.211.79.202]
+[ERROR] admin-gce-sc-1.led-prod.** couldn't ve resolved.
+[INFO ] admin-gce-sc-1.msq-dev.** [35.211.0.24]
+[ERROR] admin-gce-sc-1.hui-dev.** couldn't ve resolved.
+Continue on following 3 servers? yes
+[INFO ] 
+    
+[INFO ] Run command on 3 servers.
+[INFO ] 
+    
+[INFO ] admin-gce-sc-1.mmk-prod.**
+[INFO ] Code 0
+[INFO ] STDOUT:
+     10:20:02 up 284 days, 23:04,  0 users,  load average: 0.00, 0.08, 0.16
+    
+[INFO ] STDERR:
+    
+[INFO ] admin-gce-sc-1.msq-dev.**
+[INFO ] Code 0
+[INFO ] STDOUT:
+     10:20:03 up 186 days, 23:52,  1 user,  load average: 0.12, 0.12, 0.16
+    
+[INFO ] STDERR:
+    
+[INFO ] admin-gce-sc-1.lca-prod.**
+[INFO ] Code 0
+[INFO ] STDOUT:
+     10:20:03 up 292 days,  8:35,  0 users,  load average: 0.57, 0.49, 0.47
+    
+[INFO ] STDERR:
+```