Create matrikkelid.md (#25)

Matrikkelidentifikator docs
Norkart · Jun 6, 2023 · 0b42947 · 0b42947
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+# Matrikkelidentifikator
+
+The matrikkelidentifikator is a 20-digit string, constructed in the following manner
+
+`KKKKGGGGGBBBBFFFFSSS`
+
+Where:
+* KKKK is kommune(municipality)-number padded with zeroes to be 4 characters wide
+* GGGGG is gårdsnummer, padded with zeroes to be 5 characters wide
+* BBBB is brukssnummer, padded with zeroes to be 4 characters wide
+* FFFF is festenummer, padded with zeroes to be 4 characters wide. This is optional, and set to 0000 if not present
+* SSS is seksjonsnummer, padded with zeroes to be 3 characters wide. This is optional, and set to 000 if not present
+
+## Example
+
+We have an eiendom:
+* kommune: 0301
+* gårdsnummer: 31
+* bruksnummer: 472
+* festenummer: null
+* seksjonsnummer: null
+
+This becomes: `03010003104720000000`