docs: Improve README clarity: Expand LSP acronym and add a small note regarding package manager.

[srikar117]

This PR expands the term acronym LSP for users who might not be familiar with the term, it's just a small change that can have a big impact on accessibility.
And also added a small note to have preferred package manager installed before installing OpenCode.

[github-actions]

Hey! Your PR title Improve README clarity: Expand LSP acronym and add a small note regarding package manager. doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found