Add Why3, close #16

tools/sat-smt/why3.md

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+date = 2025-06-07
+draft = false
+title = 'Why3'
+subtitle = 'Theorem Prover'
+links = [
+    { title = "Homepage", url = "https://www.why3.org/", icon = 'fa-solid fa-home' },
+    { title = "Source Code", url = "https://why3.gitlabpages.inria.fr/releases/", icon = 'fa-brands fa-gitlab'  },
+    { title = "Playground", url = "https://www.why3.org/try/", icon = 'fa-solid fa-gamepad' }
+]
+applications = ['SMT Solver', 'Theorem Prover', 'SAT Solver']
+developers = ['Toccata', 'Inria', 'Universite Paris-Saclay', 'CNRS', 'Laboratoire Methodes Formelles']
+licenses = ['MIT']
+inputs = ['WhyML']
+interfaces = ['CLI', 'Online']
+maintenance = ['Actively Maintained']
+# techniques = ['CDCL']
+# publications = ['deMoura2008']
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+
+Why3 is a platform for deductive program verification.