add more examples

example/argmacros.jl

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+using ArgMacros
+
+function main()
+    @beginarguments begin
+        @argumentdefault Int 1 opt1 "-o" "--opt1"
+        @argumentdefault Int 2 opt2 "--opt2"
+        @argumentflag flag "--flag"
+        @positionaloptional String arg "arg"
+    end
+
+    println(" arg=>", arg)
+    println(" opt1=>", opt1)
+    println(" opt2=>", opt2)
+    println(" flag=>", flag)
+    return
+end
+
+main()

example/comonicon_zero.jl

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+"""
+ArgParse example implemented in Comonicon.
+
+# Arguments
+
+- `x`: an argument, an argument
+
+# Options
+
+- `--opt1 <arg>`: an option
+- `-o, --opt2 <arg>`: another option
+
+# Flags
+
+- `-f, --flag`: a flag
+"""
+function main(x; opt1 = 1, opt2::Int = 2, flag = false)
+    println("Parsed args:")
+    println("flag=>", flag)
+    println("arg=>", x)
+    println("opt1=>", opt1)
+    println("opt2=>", opt2)
+end
+
+include(".comonicon.cmd/cmd.jl")

example/fire.jl

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+using Fire
+
+@main function main(x; opt1 = 1, opt2::Int = 2, flag = false)
+    println("Parsed args:")
+    println("flag=>", flag)
+    println("arg=>", x)
+    println("opt1=>", opt1)
+    println("opt2=>", opt2)
+end