Added nodeenv to developers docs

docs/InstructionsForDevelopers.md

@@ -18,37 +18,51 @@ To get started with developing exercise in Robotics Academy, a developers needs
 prerequisite - Python
 
 1) First create a virtual env
-```
-virtualenv env
+```bash
+virtualenv env_name
  ```
-Virtual environment with name "env" is created 
+Virtual environment with name "env_name" is created 
 
 2) Activate the environment
+```bash
+source env_name/bin/activate
 ```
-source env/bin/activate
-```
-3) Install required packages
+
+3) Confirm that the env is successfully selected
+```bash
+which python3
 ```
+
+4) Install required packages
+```bash
 pip install django
 pip install djangorestframework
 pip install django-webpack-loader
 pip install django-cors-headers
-pip install pylint
+pip install pylint==2.* # afaik not working for v3.*, tested on 2.17.4
 ```
 
-4) Install dependencies for REACT (with Yarn or npm, required Node.JS >= 14.16)     
+5) Install node in venv
+```bash
+pip install nodeenv
+nodeenv -p
+npm install -g npm  # check installation
+npm -v
 ```
+
+6) Install dependencies for REACT (with Yarn or npm, required Node.JS >= 14.16)     
+```bash
 cd react_frontend/ && yarn install && yarn run dev
 ```
 
-5) Now at the root of the project we are ready to launch the Django webserver
-```
+7) Now at the root of the project we are ready to launch the Django webserver
+```bash
 python3 manage.py runserver
 ```
 The webserver is not connected with the RADI.
 
-6) To connect the webserver with RADI, Run:
-```
+8) To connect the webserver with RADI, Run:
+```bash
 docker run --rm -it -p 2303:2303 -p 1905:1905 -p 8765:8765 -p 6080:6080 -p 1108:1108 -p 7163:7163 jderobot/robotics-academy --no-server
 ```
 
@@ -74,7 +88,7 @@ An exercise entry in the database must include the following data:
 - ```state```: changes the state indicator (active = green; prototype = yellow; inactive = red)
 - ```language```: programming language used
 - ```configuration```: available launch options to run the exercise written in JSON. If the generic react components are used, the exercise frontend will automatically request to launch the exercise using the first configuration that matches the key ROSX (X = ROS version detected by django). If the generic circuit selector react component is used, it will automatically display all the launch options items of the array that matches the key ROSX (X = ROS version detected by django), displaying the name stored under the key "name". Sample configuration JSON including 2 launch options for ROS1 and 1 launch option for ROS2:
-```
+```json
 {"ROS1":[
 {
   "application": {