Add citation file (#10)

* Add citation file

* Add recommended citation to readme/index.md

CITATION.cff

@@ -0,0 +1,27 @@
+cff-version: 1.2.0
+title: tclf
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Markus
+    family-names: Bilz
+    email: [email protected]
+    orcid: 'https://orcid.org/0009-0009-6833-4393'
+repository-code: 'https://github.com/KarelZe/tclf'
+url: 'https://karelze.github.io/tclf/'
+abstract: >-
+  `tclf` is a scikit-learn-compatible implementation of
+  trade classification algorithms to classify financial
+  markets transactions into buyer- and seller-initiated
+  trades.
+keywords:
+  - clnv
+  - lee-ready
+  - rule-based classifier
+  - scikit-learn
+  - trade-classification
+license: BSD 3
+version: 0.0.1
+date-released: '2023-12-04'

README.md

@@ -97,6 +97,20 @@ Like before, column/feature names must follow our [naming conventions](https://k
 - Depth rule
 - Tradesize rule
 
+## Citation
+
+```latex
+@software{Bilz_tclf_2023,
+    author = {Bilz, Markus},
+    license = {BSD 3},
+    month = dec,
+    title = {{tclf}},
+    url = {https://github.com/KarelZe/tclf},
+    version = {0.0.1},
+    year = {2023}
+}
+```
+
 ## References
 
 <div class="csl-bib-body" style="line-height: 2; margin-left: 2em; text-indent:-2em;">

docs/index.md

@@ -97,6 +97,20 @@ Like before, column/feature names must follow our [naming conventions](https://k
 - Depth rule
 - Tradesize rule
 
+## Citation
+
+```latex
+@software{Bilz_tclf_2023,
+    author = {Bilz, Markus},
+    license = {BSD 3},
+    month = dec,
+    title = {{tclf}},
+    url = {https://github.com/KarelZe/tclf},
+    version = {0.0.1},
+    year = {2023}
+}
+```
+
 ## References
 
 <div class="csl-bib-body" style="line-height: 2; margin-left: 2em; text-indent:-2em;">