[enh] add pipx install and virtualenv doc in README.md

README.md

 # Tikka
 
-_The rich desktop Python client for Duniter Ğ1 crypto-currency_
+_The rich desktop Python client for Duniter V2 Ğ1 crypto-currency_
 
 **Tikka** is a rich desktop Python client to manage your Ğ1 accounts.
 
@@ -14,15 +14,39 @@ It is licenced under the [GPLv3 licence](https://www.gnu.org/licenses/gpl-3.0.en
 * [sqlite3](https://sqlite.org/index.html) database system via [sqlite3](https://docs.python.org/3/library/sqlite3.html) package
 * [Qt5](https://www.qt.io/) via [PyQt5](https://www.riverbankcomputing.com/software/pyqt/) package
 
-## Install from PyPI
+## Install with pipx
 
-If you are in a virtual python environment:
+You can use [pipx](https://pypa.github.io/pipx/installation/) to install Tikka.
+
+    pipx install tikka
+
+Then simply run the `tikka` command:
+
+    tikka
+
+Upgrade or uninstall:
+
+    pipx upgrade tikka
+
+    pipx uninstall tikka
+
+## Install/upgrade from PyPI
+
+If you are in a Python virtual environment:
 
     pip install --upgrade tikka
 
 If you are not:
 
-    pip install --user --upgrade tikka
+    # GNU/Linux virtualenv creation
+    mkdir tikka
+    cd tikka
+    python -m venv .venv
+    source .venv/bin/activate
+    pip install --upgrade tikka
+
+    # get the path of the tikka command
+    which tikka
 
 ## Run from PyPI installation
 
@@ -36,10 +60,13 @@ GNU/Linux system requirements:
 
     sudo apt-get install libsodium23 gcc
 
+Depending on distribution, you will also need `libqt5multimedia5` or `libqt5multimediaquick5` lib.
+
+
 ## Development 
 
 It is recommended to install and use [pyenv](https://github.com/pyenv/pyenv#installation) to install 
-the required python version.
+the required Python version.
 
 For Pyinstaller, you need to install Python compiled with the --enable-shared option:
 
@@ -54,10 +81,10 @@ Tikka internationalization requires gettext to be installed to generate locales
 
 Install [poetry](https://python-poetry.org/docs/#installation)
 
-At this step, it is highly recommended to setup a virtual environment to isolate python dependencies of the project from the system and avoid conflicts.
+At this step, it is highly recommended to setup a virtual environment to isolate Python dependencies of the project from the system and avoid conflicts.
 Use [poetry to manage the virtual environment](https://python-poetry.org/docs/managing-environments/).
 
-Install all python dependencies with `poetry`:
+Install all Python dependencies with `poetry`:
 
     poetry install --no-root
 
@@ -141,7 +168,7 @@ Zip package will be created in `dist` folder:
 
     dist/tikka-0.1.0.zip
 
-If Pyinstaller do not find the libpython libraries of pyenv, try to set the LD_LIBRARY_PATH env variable with the pyenv lib path:
+If Pyinstaller do not find the `libpython` libraries of `pyenv`, try to set the `LD_LIBRARY_PATH` env variable with the `pyenv` lib path:
 
 Example:
 
@@ -149,7 +176,7 @@ Example:
 
 ### CI/CD
 
-Install gitlab-runner to test .gitlab-ci.yml.
+Install `gitlab-runner` to test .gitlab-ci.yml.
 
 To test on a local docker image, specify pull policy: