[doc] soledad docs fields

- Resolves: #7712

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+=================
+Soledad Documents
+=================
+
+KeyManager uses two types of documents for the keyring:
+
+* key document, that stores each gpg key.
+
+* active document, that relates an address to its corresponding key.
+
+
+Each key can have 0 or more active documents with a different email address
+each:
+
+::
+
+  .-------------.          .-------------.
+  | foo@foo.com |          | bar@bar.com |
+  '-------------'          '-------------'
+         |                        |     
+         |      .-----------.     |     
+         |      |           |     |     
+         |      |    key    |     |     
+         '----->|           |<----'
+                |           |     
+                '-----------'
+
+
+Fields in a key document:
+
+* uids
+
+* fingerprint
+
+* key_data
+
+* private. bool marking if the key is private or public
+
+* length
+
+* expiry_date
+
+* refreshed_at
+
+* version = 1
+
+* type = "OpenPGPKey"
+
+* tags = ["keymanager-key"]
+
+
+Fields in an active document:
+
+* address
+
+* fingerprint
+
+* private
+
+* validation
+
+* last_audited_at
+
+* encr_used
+
+* sign_used
+
+* version = 1
+
+* type = "OpenPGPKey-active"
+
+* tags = ["keymanager-active"]
+
+
+The meaning of validation, encr_used and sign_used is related to the `Transitional Key Validation`_
+
+.. _Transitional Key Validation: https://leap.se/en/docs/design/transitional-key-validation