Add information about program in README.md

server-example/README.md

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+## Simple Server
+
+### Installing
+
+Before running, it is **recommended** to install the versions of packages that were used when writing this code:
+
+```sh
+pip install -r requirements.txt
+```
+
+And if you don't have installed flask yet:
+
+```sh
+apt install python3-flask
+```
+
+### Running
+
+You must inform the environment variable FLASK_APP and then run:
+
+```sh
+export FLASK_APP=hello.py
+flask run
+```
+
+ * Running on https://127.0.0.1:5000/