readme updated

README.md

@@ -2,17 +2,67 @@
 
 This a very simple implementation of Go-like flags in Odin
 
-## Usage
+## How to use
 
 ```odin
-	defer myflag.destroy()
+	import "myflag"
+
 	isRunning: bool
 	isNumber: int
 	isString: string
+	isFloat: f32
 
 	myflag.BoolVar(&isRunning, "isRunning", true, "A select piece of code is running!")
 	myflag.IntVar(&isNumber, "isNumber", 3434, "A number!")
 	myflag.StringVar(&isString, "isString", "Hellope!", "A string!")
+	myflag.Float32Var(&isFloat, "isFloat", 3.1415, "A float!")
 
 	myflag.parse_flags()
+```
+
+***Supports: bool, int, string, f32***
+
+And on the command line, you pass flags like so:
+
+```bash
+./<program name> -isNumber=45 -isRunning=false ......
+```
+
+## Usage flag: -help
+
+The package also contains a help context menu. This comes default and can be called like so
+
+```bash
+./<program name> -help
+
+	Usage:
+	-isRunning:
+		A select piece of code is running! (default: true)
+
+	-isNumber:
+		A number! (default: 3434)
+
+	-isString:
+		A string! (default: Hellope!)
+
+	-isFloat:
+		A float! (default: 3.141)
+
+```
+
+**Note:** You can set the boolean *FORCE_HELP_ON_EMPTY_ARGS* to allow for the help context menu to be displayed when no arguments are passed
+
+## Custom Allocator
+
+If needed, you are able to setup a custom allocator like so:
+
+```odin 
+	arena: vmem.Arena
+	arena_err := vmem.arena_init_growing(&arena)
+	ensure(arena_err == nil)
+	arena_alloc := vmem.arena_allocator(&arena)
+	defer vmem.arena_destroy(&arena)
+
+	myflag.init_custom_allocator(arena_alloc)
+	defer myflag.destroy() //clean up flags
 ```