changed some calculator stuff idk

idk

docs/standard library docs/application.rs.md

@@ -0,0 +1,18 @@
+- provides a simple trait to standardise the way applications are called and run from the shell or other applications. 
+
+```rust
+use async_trait::async_trait;
+
+// all applications should implment this trait and be started by using simlar to:
+let res = ImplementsApplication.run(args).await?;
+
+#[async_trait]
+pub trait Application {
+	fn new -> Self;
+
+	async fn run(&mut self, _: Vec<String>) -> Result<(), Error>;
+}
+```
+## important: 
+- the async_trait crate must be in scope in the file or else an error about trait bounds will be displayed at compile time. 
+