docs: add installation instructions

[brian-smith-tcril]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.97%. Comparing base (5a4f439) to head (aa878b9).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   98.74%   98.97%   +0.23%     
==========================================
  Files          94      105      +11     
  Lines         953     1070     +117     
  Branches      161      178      +17     
==========================================
+ Hits          941     1059     +118     
+ Misses         12       11       -1     

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[PKulkoRaccoonGang]

I'll just leave here the version of the plugin that works locally for me

from tutormfe.hooks import MFE_APPS
from tutor import hooks


@MFE_APPS.add()
def _add_catalog_mfe(mfes):
    mfes["catalog"] = {
        "repository": "https://github.com/openedx/frontend-app-catalog.git",
        "port": 1998,
        "version": "master", # optional, will default to the Open edX current tag.
    }
    return mfes

fstring = """
CATALOG_MICROFRONTEND_URL = "http://{{ MFE_HOST }}:{{ get_mfe('catalog').port }}/catalog"
"""

hooks.Filters.ENV_PATCHES.add_item(
    (
        "openedx-lms-common-settings",
        fstring,
    )
)

[PKulkoRaccoonGang]

LGTM! Thanks!