More descriptions.

README.md

@@ -1,6 +1,20 @@
-# zig-args
+# Zig Argument Parser
 Simple-to-use argument parser with struct-based config
 
+## Features
+- Automatic option generation from a config struct
+- Familiar *look & feel*:
+    - Everything after the first `--` is assumed to be a positional argument
+    - A single `-` is interpreted as a positional argument which can be used as the stdin/stdout file placeholder
+    - Short options with no argument can be combined into a single argument: `-dfe`
+- Integrated support for primitive types:
+    - All integer types (signed & unsigned)
+    - Floating point types
+    - Booleans (takes no argument)
+    - Strings
+
+## Example
+
 ```zig
 const options = try argsParser.parse(struct {
     // This declares long options for double hyphen