feat: changing path of executable and adding it in PATH dirs

Author: axrav

README.md

@@ -105,3 +105,4 @@ $ git clone https://github.com/TheHamkerCat/wallrus
 $ cd wallrus
 $ bash ./install.sh
 ```
+make sure `.cargo/bin/` is in `$PATH`

install.sh

@@ -1,7 +1,8 @@
 #!/usr/bin/bash
 
 cargo build --release
-mv target/release/wallrus .
+chmod +x target/release/wallrus
+mv target/release/wallrus $HOME/.cargo/bin/
 
 if [ -e /usr/bin/feh ]
 then