Add JS client example from webrpc repo

Author: VojtechVitek

_examples/hello-webrpc/Makefile

@@ -0,0 +1,20 @@
+all:
+	@echo "please read Makefile source or README to see available commands"
+
+tools:
+	GO111MODULE=off go get -u github.com/goware/webify
+
+generate: generate-server generate-client
+
+generate-server:
+	webrpc-gen -schema=hello-api.ridl -target=go -pkg=main -server -out=./server/hello_api.gen.go
+
+generate-client:
+	webrpc-gen -schema=hello-api.ridl -target=js -extra=noexports -client -out=./webapp/client.gen.js
+
+run-server:
+	go run ./server
+
+run-client:
+	webify -port=4444 -dir=./webapp
+

_examples/hello-webrpc/README.md

@@ -0,0 +1,19 @@
+hello-webrpc
+============
+
+* Server: Go
+* Client: Web Browser (Javascript)
+
+Simple client+server app with Go api backend (server) and Javascript Webapp (client).
+
+1. `$ make tools` - to download `webify` cli to serve the 'webapp/' local files
+2. `$ make run-server` - to start the Go server at http://localhost:4242/
+3. `$ make run-client` - to serve webapp files at http://localhost:4444/
+4. Open your browser to https://localhost:4444/ and open your console, and see rpc calls, tada
+
+webrpc comes with its own schema design language called RIDL, which stands for "RPC interface
+design language" :) it reads and feels like documentation, but it very flexible. See
+[hello-api.ridl](./hello-api.ridl) for the RIDL file for this service.
+
+as well, webrpc supports a json-formatted schema with the identical functionality as the RIDL format.
+See here, [hello-api.webrpc.json](./hello-api.webrpc.json).

_examples/hello-webrpc/hello-api.ridl

@@ -0,0 +1,28 @@
+webrpc = v1
+
+name = hello-webrpc
+version = v1.0.0
+
+enum Kind: uint32
+  - USER = 1
+  - ADMIN = 2
+
+message Empty
+
+message User
+  - ID: uint64
+    + json = id
+    + go.tag.db = id
+
+  - username: string
+    + json = USERNAME
+    + go.tag.db = username
+
+  - createdAt?: timestamp
+    + json = created_at,omitempty
+    + go.tag.db = created_at
+
+
+service ExampleService
+  - Ping() => (status: bool)
+  - GetUser(userID: uint64) => (user: User)

_examples/hello-webrpc/hello-api.webrpc.json

@@ -0,0 +1,106 @@
+{
+  "webrpc": "v1",
+  "name": "hello-api",
+  "version": "v0.0.1",
+  "messages": [
+    {
+      "name": "Kind",
+      "type": "enum",
+      "fields": [
+        {
+          "name": "USER",
+          "type": "uint32",
+          "value": "1"
+        },
+        {
+          "name": "ADMIN",
+          "type": "uint32",
+          "value": "2"
+        }
+      ]
+    },
+    {
+      "name": "Empty",
+      "type": "struct",
+      "fields": [
+      ]
+    },
+    {
+      "name": "GetUserRequest",
+      "type": "struct",
+      "fields": [
+        {
+          "name": "userID",
+          "type": "uint64",
+          "optional": false
+        }
+      ]
+    },
+    {
+      "name": "User",
+      "type": "struct",
+      "fields": [
+        {
+          "name": "ID",
+          "type": "uint64",
+          "optional": false,
+          "meta": [
+            { "json": "id" },
+            { "go.tag.db": "id" }
+          ]
+        },
+        {
+          "name": "username",
+          "type": "string",
+          "optional": false,
+          "meta": [
+            { "json": "USERNAME" },
+            { "go.tag.db": "username" }
+          ]
+        },
+        {
+          "name": "createdAt",
+          "type": "timestamp",
+          "optional": true,
+          "meta": [
+            { "json": "created_at,omitempty" },
+            { "go.tag.db": "created_at" }
+          ]
+        }
+
+      ]
+    }
+  ],
+  "services": [
+    {
+      "name": "ExampleService",
+      "methods": [
+        {
+          "name": "Ping",
+          "inputs": [],
+          "outputs": [
+            {
+              "name": "",
+              "type": "bool"
+            }
+          ]
+        },
+        {
+          "name": "GetUser",
+          "inputs": [
+            {
+              "name": "req",
+              "type": "GetUserRequest"
+            }
+          ],
+          "outputs": [
+            {
+              "name": "",
+              "type": "User"
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}