feat: Add Hebrew Git glossary term: add.md

[HodayaMoyal]

,
שלום גאבור
בהמשך לבקשתך, אני שולחת את קובץ המילון הראשון מתוך המילון המלא.
קובץ זה מוסיף את מונח "add" למילון המונחים בעברית.

את שאר קבצי המילון אשלח ב-Pull Requests נפרדים וקטנים יותר, כפי שהמלצת.

תודה, הודיה

[szabgab]

Thanks for the PR.
The files should be in a subfolder of the src folder so let's move them to src/glossary.
They should be also listed in the src/SUMMARY.md` file.
Please follow the instruction in the README file.
I'll comment on the content of the files separately.

[szabgab]

please reopen this and update this pr moving the files

[szabgab]

I am thinking aloud as I am not sure what would be the best, but it feels strange that English words are mixed in the Hebrew text. It would be probably better if the text was fully in Hebrew and where it refers to some command all those words and expressions would be links to the definition of the respective word or expression.

For example instead of "commit" I might write "קומיט" and then link to the page explaining about "commit".

I also asked a friend who is a professional translator if he could add his suggestions.