examples: add hello_world in go and nodejs

examples/go/hello_world/README.md

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+# hello_world
+
+```
+$ ./flatend
+2020/06/17 00:44:34 Listening for microservices on '127.0.0.1:9000'.
+2020/06/17 00:44:34 Listening for HTTP requests on '[::]:3000'.
+2020/06/17 00:44:37 ??? has connected to you. Services: [hello_world]
+2020/06/17 00:44:56 ??? has disconnected from you. Services: [hello_world]
+
+$ http://localhost:3000/hello
+no nodes were able to process your request for service(s): [hello_world]
+
+$ go run main.go
+2020/06/17 00:44:37 You are now connected to 127.0.0.1:9000. Services: []
+
+$ http://localhost:3000/hello
+Hello world!
+```

examples/go/hello_world/config.toml

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+addr = "127.0.0.1:9000"
+
+[[http]]
+addr = ":3000"
+
+[[http.routes]]
+path = "GET /hello"
+service = "hello_world"

examples/go/hello_world/main.go

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+package main
+
+import (
+	"github.com/lithdew/flatend"
+	"os"
+	"os/signal"
+)
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func helloWorld(ctx *flatend.Context) {
+	ctx.WriteHeader("Content-Type", "text/plain; charset=utf-8")
+	ctx.Write([]byte("Hello world!"))
+}
+
+func main() {
+	node := &flatend.Node{
+		Services: map[string]flatend.Handler{
+			"hello_world": helloWorld,
+		},
+	}
+	check(node.Start("127.0.0.1:9000"))
+
+	ch := make(chan os.Signal, 1)
+	signal.Notify(ch, os.Interrupt)
+	<-ch
+
+	node.Shutdown()
+}

examples/nodejs/hello_world/README.md

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+# hello_world
+
+```
+$ ./flatend
+2020/06/17 00:44:34 Listening for microservices on '127.0.0.1:9000'.
+2020/06/17 00:44:34 Listening for HTTP requests on '[::]:3000'.
+2020/06/17 00:44:37 ??? has connected to you. Services: [hello_world]
+2020/06/17 00:44:56 ??? has disconnected from you. Services: [hello_world]
+
+$ http://localhost:3000/hello
+no nodes were able to process your request for service(s): [hello_world]
+
+$ node index.js
+Successfully dialed 127.0.0.1:9000. Services: []
+
+$ http://localhost:3000/hello
+Hello world!
+```

examples/nodejs/hello_world/config.toml

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+addr = "127.0.0.1:9000"
+
+[[http]]
+addr = ":3000"
+
+[[http.routes]]
+path = "GET /hello"
+service = "hello_world"

examples/nodejs/hello_world/index.js

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+const {Node} = require("flatend");
+
+const main = async () => {
+    const node = new Node();
+    node.register('hello_world', ctx => ctx.send("Hello world!"));
+    await node.dial("127.0.0.1:9000");
+}
+
+main().catch(err => console.error(err));

examples/nodejs/hello_world/package.json

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+{
+  "name": "hello_world",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "flatend": "^0.0.1"
+  }
+}

examples/nodejs/hello_world/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+blake2b-wasm@^1.1.0:
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/blake2b-wasm/-/blake2b-wasm-1.1.7.tgz#e4d075da10068e5d4c3ec1fb9accc4d186c55d81"
+  integrity sha512-oFIHvXhlz/DUgF0kq5B1CqxIDjIJwh9iDeUUGQUcvgiGz7Wdw03McEO7CfLBy7QKGdsydcMCgO9jFNBAFCtFcA==
+  dependencies:
+    nanoassert "^1.0.0"
+
+blake2b@^2.1.3:
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/blake2b/-/blake2b-2.1.3.tgz#f5388be424768e7c6327025dad0c3c6d83351bca"
+  integrity sha512-pkDss4xFVbMb4270aCyGD3qLv92314Et+FsKzilCLxDz5DuZ2/1g3w4nmBbu6nKApPspnjG7JcwTjGZnduB1yg==
+  dependencies:
+    blake2b-wasm "^1.1.0"
+    nanoassert "^1.0.0"
+
+flatend@^0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/flatend/-/flatend-0.0.1.tgz#b4d4155dccf7ad696f585929accb8c9196e57b0f"
+  integrity sha512-QtIEOOCvWhl22KUdpRVgkvJK4ztYutXaGw9Dgyy4++h0esNoQ+pFek8JwyGbyiUXMO++0Lt/mR9IOsPLsHmn5Q==
+  dependencies:
+    blake2b "^2.1.3"
+    ip "^1.1.5"
+    tweetnacl "^1.0.3"
+
+ip@^1.1.5:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/ip/-/ip-1.1.5.tgz#bdded70114290828c0a039e72ef25f5aaec4354a"
+  integrity sha1-vd7XARQpCCjAoDnnLvJfWq7ENUo=
+
+nanoassert@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/nanoassert/-/nanoassert-1.1.0.tgz#4f3152e09540fde28c76f44b19bbcd1d5a42478d"
+  integrity sha1-TzFS4JVA/eKMdvRLGbvNHVpCR40=
+
+tweetnacl@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-1.0.3.tgz#ac0af71680458d8a6378d0d0d050ab1407d35596"
+  integrity sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw==