init roadmap (#724)

* init roadmap

ROADMAP.md

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+# Kratos
+
+This document defines the roadmap for Kratos development.
+
+## Features
+- [x] Config
+    - [x] Local Files
+    - [x] K8s ConfigMap
+    - [ ] Consul
+    - [ ] Etcd
+    - [ ] Nacos
+- [ ] Registry
+    - [ ] Consul
+    - [ ] Etcd
+    - [ ] K8s
+    - [ ] Nacos
+- [x] Encoding
+    - [x] JSON
+    - [x] Protobuf
+- [x] Transport
+    - [x] HTTP
+    - [x] gRPC
+- [x] Middleware
+    - [x] Logging
+    - [x] metrics
+    - [x] recovery
+    - [x] gRPC status
+    - [x] transport tracing
+    - [x] validator
+    - [ ] authentication
+    - [ ] ratelimit
+    - [ ] circuitbreaker
+- [x] Metrics
+    - [x] Prometheus
+    - [x] DataDog
+- [x] Tracing
+    - [x] HTTP
+        - [ ] TLS
+        - [x] Client
+        - [x] Service Registrar
+        - [ ] javascript/typescript clients
+    - [x] gRPC
+        - [ ] TLS
+        - [x] Uarry Handler
+        - [ ] Streaming Handler
+- [ ] Cache
+    - [ ] go-redis
+- [ ] Queue
+    - [ ] Broker API
+    - [ ] Kafka
+    - [ ] Nats
+- [ ] Database
+    - [ ] Ent
+    - [ ] Gorm
+
+## Tools
+- [x] Kratos
+- [x] HTTP Generator
+    - [ ] API YAML
+- [x] Errors Generator