qujax release v0.2.5

What's Changed

• Add contributing guidelines by @SamDuffield in #16
• Add contributing guidelines to main by @SamDuffield in #17
• Example clean by @SamDuffield in #18
• Generative modelling example clean by @SamDuffield in #19
• fix bug print_circuit by @SamDuffield in #20
• Develop by @SamDuffield in #21

Full Changelog: v0.2.4...v0.2.5