Many README "Examples" blocks are empty

[gibson042]

• Primitive Patterns
• Variable Patterns
• Custom Matchers
• etc.

[dfabulich]

@tabatkins removed the examples in 9d382b9#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R273

[littledan]

I think those examples were removed since they were based on an older version, before the use of let.

[Jack-Works]

(If you want to know the new syntax, the spec contains tons of code examples, but I agree readme should also have)