updated readme

src/README.md

@@ -1,14 +1,14 @@
 # ShanksBot-RS
 
-A rust implementation of the ShanksBot shown by Matt Parker in [this video](https://www.youtube.com/watch?v=DmfxIhmGPP4).
-
-It counts the number of decimals of a reciprocal of a given prime* number before they start repeating.
+A rust implementation of the ShanksBot shown by [Matt Parker](https://standupmaths.com/) in [this video](https://www.youtube.com/watch?v=DmfxIhmGPP4).
+It counts the number of decimals of a reciprocal of a given prime* number before they start repeating (watch the video for more details).
 
 *it is supposed to be used on prime numbers, but any positive integer will work.
 
 ## How to use
 
-If you have cargo installed, simply run ```cargo install shanksbot-rs```
+You'll need to have a [rust toolchain installed](https://www.rust-lang.org/tools/install). If you don't need the source code you can simply run ```cargo install shanksbot-rs```. Then you can use it from the command line like ```shanks 60017```.
+If you prefer running it straight from source code, clone the repository, ```cd``` into the project directory and run ```cargo run -- 60017```. The result will be printed to ```stdout```.
 
 ## What's the practical use of this?
 There is none that I know of. It was just a fun little exercise. While watching the video.