[ADD] notification standards

types/notificationFeed/README.md

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+# Notification Feed [Draft]
+
+## Schema
+
+The SCHEMA is to be described.
+
+Users get different type of notifications from users. 
+It should be used when you need a user to be notified of some event. This event might even happen outside Near Social. For example
+- You've been mentioned on a widget.
+- You are requested to do something on a website you've given permission to send you notifications
+
+On this notifications, you might even want to have a link to be redirected to the corresponding place, always considering security.
+
+## Example 1
+
+In this case, Alice would create a notification to Bob letting Bob know Alice mentioned Bob in Alice's main page with no message
+
+```json
+{
+  "alice.near": {
+    "index": {
+      "notify": {
+        "key": "bob.near",
+        "value": {
+          "type": "mention",
+          "item": {
+            "type": "social",
+            "path": "alice.near/post/main",
+            "blockHeight": 88260018,
+            "message": ""
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+## Example 2
+
+In this case, Alice would create a notification alert to Bob letting Bob know Alice played in a game along with a link to the website. For this, it is ideal to have either a whitelisted and blacklisted websites and an alert for not yet listed pages telling the user they are getting out of Near Social so they can proceed under their own risk.
+
+```json
+{
+  "alice.near": {
+    "index": {
+      "notify": {
+        "key": "bob.near",
+        "value": {
+          "type": "alert",
+          "item": {
+            "type": "social",
+            "path": "https://near.gaming",
+            "blockHeight": 88260018,
+            "message": "It's your turn"
+          }
+        }
+      }
+    }
+  }
+}
+```