Added README

Author: Nibba2018

Python/Multithreaded-Port-Scanner/README.md

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+# Multithreaded Port Scanner
+This script scans for open ports using multiple threads in parallel in which each port is checked on a separate thread. It is faster than the usual single threaded application.
+
+## Executing the script
+* Run `python scan-ports.py <IP or website name> <optional ports>`
+* for e.g the following are valid calls:
+    * `python scan-ports.py 142.250.67.142`
+    * `python scan-ports.py www.google.com`
+    * `python scan-ports.py 142.250.67.142 34 54 80 443`
+
+## Output
+
+![output1](images/output1.png)
+
+![output2](images/output2.png)