Add README.md

README.md

@@ -7,6 +7,107 @@ This PHP library contains the whole list of Italian Regions (regioni), Provinces
 
 The data comes from the official [Situas](https://situas.istat.it) service of the Istituto nazionale di statistica (Istat), that publishes its data with the [Creative Commons  versione 4.0 Deed](https://creativecommons.org/licenses/by/4.0/deed) license.
 
-> **Warning**
->
-> Work in progress
+### Installation
+
+You can install this package with [Composer](https://getcomposer.org/):
+
+```sh
+composer require mlocati/comuni-italiani
+```
+
+### Data Structure
+
+This library provides the following Italian Administrative divisions:
+
+- **Geographical Subdivisions** (*ripartizioni geografiche*)  
+  For example "Nord-ovest", "Centro", "Sud"
+- **Regions** (*regioni*)
+  For example "Piemonte", "Lazio", "Campania"
+- **Provinces** (*province*) and **Supra-Municipal Territorial Units** (**UTS** - *unità territoriale sovracomunale*)
+- **Municipalities** (*comuni*)
+
+Where:
+- every Geographical Subdivision contains one or more Regions
+- every Region contains one or more Provinces/UTS
+- every Province/UTS contains one or more Municipalities
+
+### Data Available
+
+This library provides the following data:
+
+- for the **Geographical Subdivisions**
+  - the Istat ID (example: `1`)
+  - the name (example: `'Nord-ovest'`)
+  - the first level of the current Nomenclature of Territorial Units for Statistics (NUTS1) (example: `'ITC'`)
+  - the list of Regions
+- for the **Regions**
+  - the parent Geographical Subdivision
+  - the Istat ID (example: `'01'`)
+  - the name (example: `'Piemonte'`)
+  - the type:
+    - Ordinary Status (*regione a statuto ordinario*)
+    - Special Status (*regione a statuto speciale*)
+  - the Fiscal Code (*codice fiscale*) assigned by the Agenzia delle Entrate (example: `'80087670016'`)
+  - the second level of the current Nomenclature of Territorial Units for Statistics (NUTS2) (example: `'ITC1'`)
+  - the Capital Municipality of this Region (*capoluogo di regione*) (example: `Torino`)
+  - the list of Provinces/UTS
+- for the **Provinces** / **UTS**
+  - the parent Region
+  - the Istat ID (example: `'201'`)
+  - the name (example: `'Torino'`)
+  - the historical Province code (example: `'001'`)
+  - the type:
+    - Province (*provincia*)
+    - Autonomous Province (*provincia autonoma*)
+    - Metropolitan City (*città metropolitana*)
+    - Free Consortium of Municipalities (*libero consorzio di comuni*)
+    - Non-Administrative Unit (*unità non amministrativa*) - former Provinces of Friuli-Venezia Giulia
+  - the vehicle code (*sigla automobilistica*) (example: `'TO'`)
+  - the Fiscal Code (*codice fiscale*) assigned by the Agenzia delle Entrate (example: `'01907990012'`)
+  - the third level of the current Nomenclature of Territorial Units for Statistics (NUTS3) (example: `'ITC11'`)
+  - the Capital Municipalities of this Province/UTS (*capoluogo di provincia*) (example: `Torino`)
+  - the list of Municipalities
+- for the **Municipalities**
+  - the parent Province/UTS
+  - the Istat ID (example: `'001272'`)
+  - the name (example: `'Torino'`)
+  - the Italian and Foreign names for bilingual municipalities (for example: `'Bolzano'` and `'Bozen'`)
+  - if the Municipality is the Capital Municipality of its Region (*capoluogo di regione*)
+  - if the Municipalities is a Capital Municipalities of its Province/UTS (*capoluogo di provincia*)
+  - the Cadastral Code (*codice catastale*) (example: `'L219'`)
+  - the Fiscal Code (*codice fiscale*) assigned by the Agenzia delle Entrate (example: `'00514490010'`)
+  - the first level of the current Nomenclature of Territorial Units for Statistics (NUTS1) (example: `'ITC'`)
+  - the second level of the current Nomenclature of Territorial Units for Statistics (NUTS2) (example: `'ITC1'`)
+  - the third level of the current Nomenclature of Territorial Units for Statistics (NUTS3) (example: `'ITC11'`)
+
+### Retrieving territories
+
+You can have a list of all the Geographical Subdivisions, Regions, Provinces/UTS, and Municipalities using the `Factory` class.
+
+For example:
+
+```php
+
+use MLocati\ComuniItaliani\Factory;
+
+$factory = new Factory();
+
+$allGeographicalSubdivisions = $factory->getGeographicalSubdivisions();
+$allRegions = $factory->getRegions();
+$allProvinces = $factory->getProvinces();
+$allMunicipalities = $factory->getMunicipalities();
+```
+
+If you want to retrieve a territory given its ID, you can use the `Finder` class:
+
+```php
+
+use MLocati\ComuniItaliani\Finder;
+
+$finder = new Finder();
+
+$geographicalSubdivision = $finder->getGeographicalSubdivisionByID(1);
+$region = $finder->getRegionByID('01');
+$province = $finder->getProvinceByID('201');
+$municipality = $finder->getMunicipalityByID('001272');
+```