docs: Add beginner tips and example to primer.md #4782
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This commit adds a new section titled "Tips for Beginners" at the end of primer.md. It includes practical guidance for new users on when to use EXPECT_* vs ASSERT_*, how to structure test cases, and how to name test suites.
Additionally, a minimal Add() function test example is provided to illustrate basic usage of GoogleTest macros. This change aims to make the documentation more beginner-friendly and help first-time contributors quickly understand core testing patterns.