Add Wickra to Financial

[kingchenc]

Adds Wickra to the Financial section (alphabetical, after ta4j).

Wickra is an open-source (MIT OR Apache-2.0, not GPL/AGPL) technical-analysis library with a Rust core, exposed to Java via its C ABI and published on Maven Central as org.wickra:wickra. English docs at docs.wickra.org.

How it differs from ta4j (the existing TA entry):

• 514 indicators across 24 families vs the ~130 of ta4j - including market microstructure, order-flow/derivatives, market profile and Ehlers DSP cycles.
• A native Rust core instead of a pure-Java reimplementation; every indicator updates in O(1) per tick.
• batch == streaming is bit-exact, fuzzed and 100%-line-covered for all 514, so backtest and live results match.
• The exact same engine is shared across nine languages (Python, Node.js, WASM, Rust, C, C++, C#, Go, R), not a Java-only port.

Repo: https://github.com/wickra-lib/wickra

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Summary by cubic

Add Wickra to the Financial libraries list in README, listed after ta4j. The entry links to the repo and notes the org.wickra:wickra Maven artifact and 514 O(1)-per-tick indicators on a Rust core.

^{Written for commit 3f59c4e. Summary will update on new commits.}

[cubic-dev-ai]

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