Documentation on how to use plugin generator is not fully clear

[jmsanchez7]

Describe the bug
When trying to create a new plugin for flamapy using the plugin generator, the docuemntation regarding it is not clear. The error happens when trying to execute the command "generate_plugin": File not found error: [Errno 2] No such file or directory: 'skel_metamodel/'.

To Reproduce
Steps to reproduce the behavior:

1. Follow every step in https://docs.flamapy.org/developing/setting_development_environment/ , which include:
   1.1. Making a new directory for flamapy and accesing it:

mkdir ~/flamapy
cd ~/flamapy

1.2. Cloning the flamapy_fw, fm_metamodel, pysat_metamodel, bdd_metamodel repos:

git clone https://github.com/flamapy/flamapy_fw.git
git clone https://github.com/flamapy/fm_metamodel.git
git clone https://github.com/flamapy/pysat_metamodel.git
git clone https://github.com/flamapy/bdd_metamodel.git

1.3. In this case, launch a WSL terminal in flamapy folder we created.
1.4. Setting PLUGIN_PATH enviroment variable:

export PLUGIN_PATHS=/mnt/c/Users/jsanchez/Desktop/Proyectos/flamapy/fm_metamodel/:/mnt/c/Users/jsanchez/Desktop/Proyectos/flamapy/pysat_metamodel/:/mnt/c/Users/jsanchez/Desktop/Proyectos/flamapy/bdd_metamodel/

1.5. Setting developer mode using Makefile (a change has to be done in the file, changing python3.9 for python3, already reported in flamapy/flamapy_fw#104):

cd flamapy_fw
make dev

2. Follow every step in https://docs.flamapy.org/developing/extending_with_your_plugins/ , which include:
   2.1. In our virtual enviroment, install flamapy basic package:

pip install flamapy

2.2. Create new folder for our plugin (in this case, called ts_metamodel):

cd core && mkdir ./ts_metamodel

2.3. Use "generate_plugin":

flamapy generate_plugin./ts_metamodel ts ts

2.4. Previous step (2.3) will result in an error that can be solved by changing the order of the params:

flamapy generate_plugin ts ts ./ts_metamodel

2.5. Previous step (2.4) will also result in an error that can be solved by cloning the https://github.com/flamapy/flamapy and executing "generate_plugins" in it.

cd /path/to/flamapy/folder
git clone https://github.com/flamapy/flamapy.git
cd flamapy && mkdir ./ts_metamodel
flamapy generate_plugin ts ts ./ts_metamodel

Expected behavior
Following the documentation, users should be able to create a plugin usin the plugin generator.

Screenshots
Error in step 2.3:

Error in step 2.4:

Result in step 2.5:

Desktop (please complete the following information):

• OS: Windows 11 (using WSL)

Additional context
A clearer documentation on the topic could help other users to follow steps easily.