Add opinion creation page

[talisraeli]

• [ ] Add a new component for opinion creation page.
• [ ] Create a new route for it (/create)
• [ ] In the page, add a form with opinion content input field and a submission button at the end.
• [ ] Add a text validation for the content input using the following Regex expression: /(?!.*\s{2,}.*)^[a-zA-Zא-ת\d ]{8,128}$/g
• [ ] Add an error message when the input is invalid or submission failed.