[cpp][tiny] rename generator, update samples (#9560)

* rename generator, update samples

* add doc

* update readme

samples/client/petstore/cpp-tiny/src/main.cpp

@@ -0,0 +1,37 @@
+#include "PetApi.h"
+
+const char* ssid = "your wifi name"; // TODO Change wifi name
+const char* password = "Your wifi password"; //TODO Change wifi password
+
+
+void setup(){
+    //Initialize serial and wait for port to open:
+    Serial.begin(9600);
+    delay(100);
+
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    WiFi.begin(ssid, password);
+
+    // attempt to connect to Wifi network:
+    while (WiFi.status() != WL_CONNECTED) {
+    Serial.print(".");
+    // wait 1 second for re-trying
+    delay(1000);
+    }
+
+    Serial.print("Connected to ");
+    Serial.println(ssid);
+
+    //Print LAN IP.
+    Serial.print("IP address set: ");
+    Serial.println(WiFi.localIP());
+
+    Tiny::PetApi petapi;
+    auto resp = petapi.getPetById(10);
+    Serial.println(resp.code);
+    Tiny::Pet pet = resp.obj;
+    Serial.println(pet.toJson().dump().c_str());
+}
+
+void loop(){}