docs: add readme

README.md

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+# go-chat
+
+## About
+- cmd/scd: Entrypoint, the main application or service.
+
+- config/config.go: Contains the configuration setup for the application
+
+- graphql: This directory contains several Go files related to GraphQL
+  - docs: Might contain documentation or schemas related to GraphQL.
+  - query.go: Defines GraphQL queries.
+  - type.go: Defines GraphQL types.
+  - schema.go: Defines the GraphQL schema.
+  - subscription.go: Handles GraphQL subscriptions, which are used for real-time functionality, a common feature in chat applications.
+  - mutation.go: Manages GraphQL mutations for creating, updating, or deleting data.
+  - resolver.go: Contains resolver functions that handle the business logic for GraphQL queries and mutations.
+
+- internal: Service code
+  - dto: Stands for Data Transfer Objects
+  - domain: Typically includes domain models and business logic.
+
+- util/uuid.go: A utility file, possibly for generating or handling UUIDs, which are often used for unique identifiers in applications.
+- tool/dynamo: This could be a tool or script related to Amazon DynamoDB, suggesting that DynamoDB might be used as a database for the chat application.