Added Channel model and API for it

schema/root.graphql

@@ -6,7 +6,14 @@ type Query {
   # Find characters by either a list of ids, nicks or an author. Only one parameter at a time
   characters(ids: [String!], nicks: [String!], author: String): [Character!]!
   
+
+  # Find channel by name
+  channel(name: String!): Channel
+
+  # Find all channels. Specifying `logged: true` restricts the search to only logged.
+  channels(logged: Boolean): [Channel!]!  
   
+
   # Find log by ID
   log(id: String): Log
 
@@ -51,6 +58,16 @@ type Mutation {
   removeCharacter(id: String!): Character!
 
 
+  # Add a channel
+  addChannel(input: ChannelAddInput!): Channel!
+
+  # Edit a channel
+  editChannel(input: ChannelEditInput!): Channel!
+
+  # Remove a channel
+  removeChannel(name: String!): Channel!
+
+
   # Add a new log
   addLog(input: LogAddInput!): Log!