Dev Docs: Add Glossary Entries & Search Links

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

Closes #593

_data/glossary/en/merkle-root.yaml

@@ -0,0 +1,31 @@
+---
+# 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: Merkle Root
+
+    summary_max_255_characters_no_formatting: >
+        The root node of a merkle tree, a descendant of all the hashed
+        pairs in the tree.  Block headers must include a valid merkle
+        root descended from all transactions in that block.
+
+    synonyms_shown_in_glossary_capitalize_first_letter:
+        - Merkle root
+
+optional:
+    synonyms_and_pluralizations_not_shown_in_glossary:
+        - merkle roots
+
+    not_to_be_confused_with_capitalize_first_letter:
+        - Merkle tree (the tree of which the merkle root is the root node)
+        - Merkle block (a partial merkle branch connecting the root to one or more leaves [transactions])
+
+    links_html_or_markdown_style_capitalize_first_letter:
+        - "[Merkle root](/en/developer-guide#term-merkle-root) --- Bitcoin.org Developer Guide"
+        - "[Merkle trees](https://en.bitcoin.it/wiki/Protocol_documentation#Merkle_Trees) --- Bitcoin Wiki"
+        - "[What is the merkle root?](http://bitcoin.stackexchange.com/q/10479) --- Bitcoin StackExchange"
+        - "[Merkle tree](https://en.wikipedia.org/wiki/Merkle_tree) --- Wikipedia"
+
+---