feat: add graphql mutations, queries and types

Author: OLuwis

src/main/resources/graphql/mutations.graphqls

@@ -0,0 +1,7 @@
+type Mutation {
+    userSignup(username: String!, email: String!, password: String!): User!
+    createTodo(title: String!, description: String!): Todo!
+    deleteTodo(id: ID!): String!
+    updateTodo(title: String!, description: String!, status: Boolean!): Todo!
+    completeTodo: Todo!
+}

src/main/resources/graphql/queries.graphqls

@@ -0,0 +1,4 @@
+type Query {
+    getTodos(userid: ID!): [Todo!]
+    userLogin(email: String!, password: String!): User!
+}

src/main/resources/graphql/types.graphqls

@@ -0,0 +1,14 @@
+type Todo {
+    id: ID!
+    title: String!
+    description: String!
+    status: Boolean!
+    userid: ID!
+}
+
+type User {
+    id: ID!
+    username: String!
+    email: String!
+    password: String!
+}