nip15: create draft

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+NIP-15
+======
+
+End of Stored Events Notice
+---------------------------
+
+`draft` `optional` `author:Semisol`
+
+Relays may support notifying clients when all stored events have been sent.
+
+If a client sets `eose_notice` field to `true` in any of the filters in a `REQ` message and the relay supports this NIP, the relay MUST send the client a `EOSE` message in the format `["EN", <subscription_id>]` which indicates that all stored events matching the filters specified have been sent and all events from on are newly published events.
+
+Example Subscription Filter
+---------------------------
+
+The following provides an example of a filter that requests the `set_metadata` (`0`) event(s) of a pubkey and requests the server to send an end of stored events message.
+
+```
+{
+  "kinds": [0],
+  "authors": ["52b4a076bcbbbdc3a1aefa3735816cf74993b1b8db202b01c883c58be7fad8bd"],
+  "eose_notice": true
+}
+```
+
+Client Behavior
+---------------
+
+Clients SHOULD use the `supported_nips` field to learn if a relay supports end of stored events notices.  Clients MAY send filters with `eose_notice` to any relay, if they are prepared to not receive a message from relays that do not support this NIP.
+
+Motivation
+----------
+
+The motivation for this proposal is to reduce uncertainty when all events have been sent by a relay to make client code possibly less complex.