mod(structure): update project structure

Remove examples, add description for design goals in README.md and
apply re-names and naming changes accordingly for the project structure.
Implement a flat hierachry, as the library shall remain pretty simple.

src/size.zig

@@ -0,0 +1,10 @@
+pub const Size = @This();
+
+pub const Position = struct {
+    col: u16,
+    row: u16,
+};
+
+anchor: Position = .{},
+cols: u16,
+rows: u16,