Initial commit: Python SDK for Dragonchain (Prime)

Synchronous Python SDK modeled on prime-sdk-go. Provides DC1-HMAC-SHA256
auth, dataclass models, and resource clients for system, transaction,
transaction-type, smart-contract, and block endpoints, plus a YAML
credentials loader.

pyproject.toml

@@ -0,0 +1,27 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "prime-sdk-python"
+version = "0.1.0"
+description = "A self-contained Python SDK for interacting with Dragonchain nodes."
+readme = "README.md"
+requires-python = ">=3.9"
+license = { text = "Apache-2.0" }
+authors = [{ name = "Dragonchain" }]
+keywords = ["dragonchain", "blockchain", "sdk", "prime"]
+dependencies = [
+    "requests>=2.25",
+    "PyYAML>=5.4",
+]
+
+[project.urls]
+Homepage = "https://git.dragonchain.com/dragonchain/prime-sdk-python"
+Repository = "https://git.dragonchain.com/dragonchain/prime-sdk-python"
+
+[project.optional-dependencies]
+dev = ["pytest>=7.0"]
+
+[tool.hatch.build.targets.wheel]
+packages = ["prime_sdk"]