Safe Core SDK v0.1.0

What's Changed

• Add Contributor License Agreement by @germartinez in #8
• Handle signatures by @germartinez in #5
• Add read methods by @germartinez in #6
• On-chain signatures by @germartinez in #16
• Add GitHub templates by @germartinez in #18
• Handle write contract functions by @germartinez in #19
• Gas estimation and improvements by @germartinez in #17

Full Changelog: https://github.com/safe-global/safe-core-sdk/commits/v0.1.0