Fix -h and add a README

README.md

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+
+# Rust 3x+1
+
+Simple tool to bruteforce 3x+1 for a second loop. Only takes positive numbers.
+
+
+## Usage
+
+```bash
+USAGE:
+    rust-3xp1.exe [OPTIONS]
+
+OPTIONS:
+    -c, --count <COUNT>     Number of times to try [default: 50000]
+    -d, --double-verbose    Weather to output current number every step of 3x+1
+    -h, --help              Print help information
+    -s, --start <START>     Number to start at [default: 195147905179352825856]
+    -v, --verbose           Weather to output current number each time
+    -V, --version           Print version information
+```
+
+
+## Demo
+
+![](https://files.buymymojo.net/ussgwsivh9co.gif)
+## FAQ
+
+#### What is 3x+1?
+
+check out [this](https://youtu.be/094y1Z2wpJg) viceo by Veritasium
+
+#### Why?
+
+This hasn't left my brain since I saw the video, I wanted to mess around with a tool to brute force for a new loop.
+