Add Wickra to Finance

[kingchenc]

Adds wickra to the Finance section.

wickra is an open-source (MIT OR Apache-2.0) technical-analysis library with a Rust core and R bindings, installable from r-universe:
install.packages("wickra", repos = "https://wickra-lib.r-universe.dev")

Highlights:

• 514 indicators across 24 families, every one updating in O(1) per observation.
• The same engine runs batch (TA-Lib-style) and live tick-by-tick streaming; batch == streaming is bit-exact and fully test-covered.
• No system dependencies, no compilation toolchain required.
• The identical engine is also available for Python, Node.js, WebAssembly, Rust, Go, Java and C/C++.
• MIT OR Apache-2.0.

Repo: https://github.com/wickra-lib/wickra · Docs: https://docs.wickra.org