chore: start describing the language

Cargo.toml

···
 #schema="https://www.schemastore.org/cargo.json
 [workspace]
 members = ["./megatonc"]
+resolver = "3"
 default-members = ["megatonc"]
 
 [workspace.package]

DESIGN.md

···
+# Megaton - a language to blow minds
+with how boring it is.
+
+## Ideas
+
+### Uniformity
+
+* Polymorphism expressed as functions from types to types
+* Comptime code generation instead of derives
+

examples/fib_iterative.mt

···
 }
 
 fn fib(n: i32) {
-    let a = 
+    let a = n? <2 : 
 }

megatonc/src/main.rs

···
-fn main() {
-    println!("Hello, world!");
+use std::fs::read_to_string;
+
+enum Operation {
+    Compile { file: String },
+    Exit,
+}
+
+fn args() -> Operation {
+    let mut args = std::env::args().skip(1);
+    if let Some(file) = args.next() {
+        Operation::Compile { file }
+    } else {
+        Operation::Exit
+    }
+}
+fn main() -> std::io::Result<()> {
+    match args() {
+        Operation::Compile { file } => {
+            println!("Compiling {file:?}");
+            compile(&file)
+        }
+        Operation::Exit => Ok(()),
+    }
+}
+
+fn compile(file: &str) -> std::io::Result<()> {
+    let src = read_to_string(file)?;
+
+    Ok(())
 }