Add examples (#78)

* Add tiny example

* fix basic exmaple

* Add server/client exmaples

Co-authored-by: Emil Ivanichkov <emil.ivanichkov@gmail.com>

---------

Co-authored-by: Emil Ivanichkov <emil.ivanichkov@gmail.com>

examples/basic.nim

@@ -0,0 +1,17 @@
+import pkg/presto/[route, server]
+
+proc decodeString*(t: typedesc[string], value: string): RestResult[string] =
+  ok(value)
+
+proc validate(pattern: string, value: string): int = 0
+
+when isMainModule:
+  var router = RestRouter.init(validate)
+
+  router.api(MethodGet, "/") do () -> RestApiResponse:
+    RestApiResponse.response("Hello World", Http200, "textt/plain")
+
+  let restServer = RestServerRef.new(router, initTAddress("127.0.0.1:9000")).get
+  restServer.start()
+
+  runForever()

examples/client.nim

@@ -0,0 +1,12 @@
+import pkg/presto/[route, client]
+import ../tests/helpers
+
+proc hello() {.async.} =
+  var restClient = RestClientRef.new(initTAddress("127.0.0.1:9000"))
+  proc helloCall(body: string): string {.
+      rest, endpoint: "/hello/world", meth: MethodPost.}
+  let res = await restClient.helloCall("Hello Server!", restContentType = "text/plain")
+  echo "Server response: ", res
+
+when isMainModule:
+  waitFor hello()

examples/server.nim

@@ -0,0 +1,18 @@
+import pkg/presto/[route, server]
+import stew/byteutils
+
+proc validate(pattern: string, value: string): int = 0
+
+when isMainModule:
+  var router = RestRouter.init(validate)
+
+  router.api(MethodPost, "/hello/world") do (
+             contentBody: Option[ContentBody]) -> RestApiResponse:
+    echo "Client says: ", string.fromBytes(contentBody.get().data)
+
+    RestApiResponse.response("Hello Client, I am Server", Http200, "textt/plain")
+
+  let restServer = RestServerRef.new(router, initTAddress("127.0.0.1:9000")).get
+  restServer.start()
+
+  runForever()