Add model checkers. Close #2

tools/lang/_index.md

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+title = "Languages"
+layout = "section"
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+
+This page lists all of the languages on this site in alphabetical order.
+Click a tool name in the first column to view tool details. 
+Click a colorful item in the second column to view all the tools for which that term applies.
+Item colors mean nothing and are intended to make it easy to skim the page. 
+Colors are generated by hashing each term's name and converting it to RGB color values.

tools/lang/tlaplus.md

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+date = 2025-06-07
+draft = false
+title = 'TLA+'
+subtitle = 'Modeling Language'
+links = [
+    { title = "Homepage", url = "https://lamport.azurewebsites.net/tla/tla.html", icon = 'fa-solid fa-home' },
+    # { title = "Source Code", url = "https://github.com/TAPAAL/", icon = 'fa-brands fa-github'  },
+    # { title = "Playground", url = "https://cvc5.github.io/app/", icon = 'fa-solid fa-gamepad' }
+]
+applications = ['Modeling Language']
+developers = [' Leslie Lamport']
+licenses = ['Open Source 3.0', 'BSD', 'GPLv2']
+# inputs = ['Sally']
+# interfaces = ['CLI']
+maintenance = ['Actively Maintained']
+# techniques = ['CDCL']
+# publications = ['']
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+
+<!-- {{<inactive year="2012">}} -->
+<!-- {{<closed-source>}} -->
+TLA+ is a high-level language for modeling programs and systems--especially concurrent and distributed ones.