NIP-56: Reporting (#205)

Co-authored-by: Semisol <45574030+Semisol@users.noreply.github.com>
Co-authored-by: Leo Wandersleb <leo@leowandersleb.de>

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+
+NIP-56
+======
+
+Reporting
+---------
+
+`draft` `optional` `author:jb55`
+
+A report is a `kind 1984` note that is used to report other notes for spam,
+illegal and explicit content.
+
+The content MAY contain additional information submitted by the entity
+reporting the content.
+
+Tags
+----
+
+The report event MUST include a `p` tag referencing the pubkey of the user you
+are reporting.
+
+If reporting a note, an `e` tag MUST also be included referencing the note id.
+
+A `report type` string MUST be included as the 3rd entry to the `e` or `p` tag
+being reported, which consists of the following report types:
+
+- `nudity` - depictions of nudity, porn, etc.
+- `profanity` - profanity, hateful speech, etc.
+- `illegal` - something which may be illegal in some jurisdiction
+- `spam` - spam
+- `impersonation` - someone pretending to be someone else
+
+Some report tags only make sense for profile reports, such as `impersonation`
+
+Example events
+--------------
+
+```json
+{
+  "kind": 1984,
+  "tags": [
+    [ "p", <pubkey>, "nudity"]
+  ],
+  "content": "",
+  ...
+}
+
+{
+  "kind": 1984,
+  "tags": [
+    [ "e", <eventId>, "illegal"],
+    [ "p", <pubkey>]
+  ],
+  "content": "He's insulting the king!",
+  ...
+}
+
+{
+  "kind": 1984,
+  "tags": [
+    [ "p", <impersonator pubkey>, "impersonation"],
+    [ "p", <victim pubkey>]
+  ],
+  "content": "Profile is imitating #[1]",
+  ...
+}
+```
+
+Client behavior
+---------------
+
+Clients can use reports from friends to make moderation decisions if they
+choose to. For instance, if 3+ of your friends report a profile as explicit,
+clients can have an option to automatically blur photos from said account.
+
+
+Relay behavior
+--------------
+
+It is not recommended that relays perform automatic moderation using reports,
+as they can be easily gamed. Admins could use reports from trusted moderators to
+takedown illegal or explicit content if the relay does not allow such things.