add Creative Commons copyright to all docs

Signed-off-by: Jakub Sokołowski <jakub@status.im>

docs/draft/15-notifications.md

@@ -39,4 +39,3 @@ Push Notifications, as offered by Apple and Google are a privacy concern, they r
 ## Copyright
 
 Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
-

docs/draft/7-group-chat.md

@@ -156,3 +156,7 @@ If the event is valid a client MUST remove the member from the list of `members`
 Upon receiving this event a client MUST validate the `chatId` provided with the updates, MUST ensure that the author of the event is also the target of the event.
 
 If the event is valid a client MUST remove the member from the list of `admins` of the chat.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/1-client.md

@@ -414,3 +414,6 @@ Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad4
 - Added language to include Waku in all relevant places
 - Change to keep `Mailserver` term consistent 
 
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/10-waku-usage.md

@@ -361,3 +361,7 @@ Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad4
   - [Exists here](https://github.com/status-im/status-go/blob/2d13ccf5ec3db7e48d7a96a7954be57edb96f12f/waku/api.go#L100-L108)
 - Changed `shhext_requestMessages` to `wakuext_requestMessages`
   - [Exists here](https://github.com/status-im/status-go/blob/2d13ccf5ec3db7e48d7a96a7954be57edb96f12f/services/wakuext/api.go#L76-L139)
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/11-waku-mailserver.md

@@ -128,3 +128,7 @@ Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad4
 - Forked from [4-whisper-mailserver](4-whisper-mailserver.md)
 - Change to keep `Mailserver` term consistent
 - Replaced Whisper references with Waku
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/2-account.md

@@ -435,3 +435,7 @@ Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad4
 - Added language to include Waku in all relevant places
 - Change to keep `Mailserver` term consistent 
 - Added clarification to Open Whisper Systems
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/3-whisper-usage.md

@@ -364,3 +364,7 @@ Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad4
 
 - Added Whisper / Waku Bridging section
 - Change to keep `Mailserver` term consistent 
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/4-whisper-mailserver.md

@@ -122,3 +122,7 @@ Since a `Mailserver` is delivering expired envelopes and has a direct TCP connec
 Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad409e4c007fefc8c8945b8d324e8)
 
 - Change to keep `Mailserver` term consistent
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/5-secure-transport.md

@@ -547,3 +547,7 @@ In this case an empty message containing bundle information is sent back, which
 Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad409e4c007fefc8c8945b8d324e8)
 
 - Added language to include Waku in all relevant places
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/6-payloads.md

@@ -378,3 +378,7 @@ There are two ways to upgrade the protocol without breaking compatibility:
 Released [May 22, 2020](https://github.com/status-im/specs/commit/664dd1c9df6ad409e4c007fefc8c8945b8d324e8)
 
 - Added language to include Waku in all relevant places
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/8-eips.md

@@ -233,3 +233,7 @@ Description: Allows the storing and retrieving of nodes through merkle trees sto
 Used for: Finding Waku nodes.
 Related: -
 Sourcecode: - 
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

docs/spec/9-ethereum-usage.md

@@ -227,4 +227,3 @@ A client SHOULD verify ens names against the public key of the sender on receivi
 ## Copyright
 
 Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
-