feat: updates to peerfinder app

app/mercury/mercury.graphqls

@@ -0,0 +1,8 @@
+extend type Query{
+    keys(namespace: String!) [String!]!
+    get(namespace: String! keys: [String!]) [String]!
+}
+
+extend type Mutation{
+    set(namespace: String! key: String! value: String): Bool!
+}