core: add a python provider configuration

- Adds a configuration to use a virtual environment as the python
  provider.
- Documents it shortly.

Co-Authored-by: iGor milhit <igor@milhit.ch>

README.md

@@ -23,6 +23,10 @@ This new configuration is written with the help of:
 - A [nerd font][3].
 - [`vscode-langservers-extracted`][6]. It's mandatory for the JSON LSP.
 
+## Python provider
+
+I'm using a virtual environment for the python provider, as the
+[documentation][7], using `pyenv`.
 
 ## Structure
 
@@ -107,3 +111,4 @@ I won't provide links for each of these plugins as they are easily to be found.
 [4]: https://github.com/nvim-lua/kickstart.nvim
 [5]: https://vincent.jousse.org/blog/fr/tech/configurer-neovim-comme-ide-a-partir-de-zero-tutoriel-guide
 [6]: https://github.com/hrsh7th/vscode-langservers-extracted
+[7]: https://neovim.io/doc/user/provider.html#python-virtualenv

lua/core/init.lua

@@ -1,3 +1,4 @@
 -- Load all module files
+require("core.python-provider")
 require("core.keymaps")
 require("core.options")

lua/core/python-provider.lua

@@ -0,0 +1,4 @@
+-- Set a virtualenv as python provider
+--  https://neovim.io/doc/user/provider.html#python-virtualenv
+
+vim.g.python3_host_prog = "/home/igor/.pyenv/versions/py-nvim3.10/bin/python"