Add upu.int/ postal addressing rules to metadata

model/countries/CA/CA-metadata.yaml

@@ -1,2 +1,4 @@
 country: CA
-flag: 🇨🇦
+flag: 🇨🇦
+overview: |
+    Addresses in Canada follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/canEn.pdf" > DOCUMENT</a>.

model/countries/DE/DE-metadata.yaml

@@ -1,2 +1,6 @@
 country: DE
 flag: 🇩🇪
+
+
+overview: |
+    Addresses in Germany follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/deuEn.pdf" > DOCUMENT</a>.

model/countries/FR/FR-metadata.yaml

@@ -1,2 +1,5 @@
 country: FR
 flag: 🇫🇷
+
+overview: |
+    Addresses in France follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/fraEn.pdf" > DOCUMENT</a>.

model/countries/IT/IT-metadata.yaml

@@ -1,2 +1,5 @@
 country: IT
 flag: 🇮🇹
+
+overview: |
+    Addresses in Italy follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/itaEn.pdf" > DOCUMENT</a>.

model/countries/MX/MX-metadata.yaml

@@ -1,2 +1,5 @@
 country: MX
 flag: 🇲🇽
+
+overview: |
+    Addresses in Mexico follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/mexEn.pdf" > DOCUMENT</a>.

model/countries/NL/NL-metadata.yaml

@@ -5,6 +5,7 @@ overview: |
  <p>Netherlands address forms rarely use the address line concept.
  Instead, they use more granular fields describing entities like city, postal code, state, street name, and building number.
  This addressing system is unified across the country, except for a few cities and districts.
+ The unified structure is described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/nldEn.pdf" > DOCUMENT</a>.
  Address fields in the Netherlands can be divided into two groups: high-level location and street address.</p>
  <p><b>High-level location</b></p>
  <p>High-level location fields are: country, state, city, and postal code.

model/countries/PL/PL-metadata.yaml

@@ -2,7 +2,7 @@ country: PL
 flag: 🇵🇱
 
 overview: |
-
- Street Addresses in Poland typically consist of street name, building number and apartment number. 
- Specifically for data model of Poland the node <b>building-and-unit</b> was created to store house number and apartment number in one node. 
- The whole node of street-address for Poland in redundant, since the data is stored in <b>building-location</b> node, but we keep the main <b>street-address</b> node to preserve generic i18n project tree like data structure.
+  Addresses in Poland follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/polEn.pdf" > DOCUMENT</a>.
+  Street Addresses in Poland typically consist of street name, building number and apartment number. 
+  Specifically for data model of Poland the node <b>building-and-unit</b> was created to store house number and apartment number in one node. 
+  The whole node of street-address for Poland in redundant, since the data is stored in <b>building-location</b> node, but we keep the main <b>street-address</b> node to preserve generic i18n project tree like data structure.

model/countries/US/US-metadata.yaml

@@ -1,2 +1,5 @@
 country: US
 flag: 🇺🇸
+
+overview: |
+    Addresses in the US follow the structure described in the following <a href="https://www.upu.int/UPU/media/upu/PostalEntitiesFiles/addressingUnit/usaEn.pdf" > DOCUMENT</a>.