Add RNDIS examples to tests, remove "stm32/nucleo*" examples from "examples" test group

examples/esp8266/http-client-server/README.md

@@ -0,0 +1,22 @@
+# An example ESP8266 application
+
+To build this application, follow these steps:
+
+1. Make sure you have Docker installed
+2. Clone whole mongoose repository on your machine:
+  ```sh
+  git clone https://github.com/cesanta/mongoose.git
+  ```
+3. Start command line or terminal, and go into the example's directory:
+  ```sh
+  cd mongoose/examples/esp8266
+  ```
+4. Run `make`. This invokes a Docker-based build. A firmware will be built
+  in the `src/build/` directory:
+  ```sh
+  make build
+  ```
+5. Flash your ESP8266. If you have esptool.py installed, the build process will end telling you the command to flash your device. You can just run `make` again to use Docker:
+  ```sh
+  make flash PORT=/your/serial
+  ```