Create README.md

Author: julien-c

README.md

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+iso3166
+=======
+
+ISO 3166-1 alpha-2 mapping:
+
+```php
+echo Iso3166\Codes::map('FR');
+// 'France'
+```
+
+Plus one super handy helper:
+
+```php
+echo Iso3166\Codes::select('class', 'name', 'FR');
+```
+
+will output:
+
+```html
+<select class="class" name="name">
+  <option value="AF">Afghanistan</option>
+  ...
+  <option value="FR" selected>France</option>
+  ...
+</select>
+```