📜 docs: add documentation for the new config option (#175)

docs/configuration.md

@@ -23,6 +23,7 @@ Some of the configuration options provided in the file are stated below. These a
 
 - **logging:** An option to enable or disable logs.
 - **debug:** An option to enable or disable debug mode.
+- **threads:** The amount of threads that the app will use to run (the value should be greater than 0).
 
 ## Server
 

docs/installation.md

@@ -79,6 +79,7 @@ After that edit the config.lua file located under `websurfx` directory. In the c
 -- ### General ###
 logging = true -- an option to enable or disable logs.
 debug = false -- an option to enable or disable debug mode.
+threads = 10 -- the amount of threads that the app will use to run (the value should be greater than 0).
 
 -- ### Server ###
 port = "8080" -- port on which server should be launched