Dev Docs: Add Glossary Entries & Search Links

This adds the data used to populate the glossary and search terms.

Closes #593

_data/glossary/en/signature-script.yaml

@@ -0,0 +1,29 @@
+---
+# This file is licensed under the MIT License (MIT) available on
+# http://opensource.org/licenses/MIT.
+
+required:
+                                           #-------------40 characters-------------#
+    title_max_40_characters_no_formatting: Signature Script, ScriptSig
+
+    summary_max_255_characters_no_formatting: >
+        Data generated by a spender which is almost always used as
+        variables to satisfy a pubkey script. Called a scriptSig in
+        code.
+
+    synonyms_shown_in_glossary_capitalize_first_letter:
+        - Signature script
+        - ScriptSig
+
+optional:
+    synonyms_and_pluralizations_not_shown_in_glossary:
+        - signature scripts
+        - scriptSigs
+
+    not_to_be_confused_with_capitalize_first_letter:
+        - ECDSA signature (a signature, which can be used as part of a pubkey script in addition to other data)
+
+    links_html_or_markdown_style_capitalize_first_letter:
+        - "[Signature script](/en/developer-guide#term-signature-script) --- Bitcoin.org Developer Guide"
+
+---