Dev Docs: Add Glossary Entries & Search Links

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

Closes #593

_data/glossary/en/master-chain-code-and-private-key.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: Master Chain Code And Private Key
+
+    summary_max_255_characters_no_formatting: >
+        In HD wallets, the master chain code and master private key are
+        the two pieces of data derived from the root seed.
+
+    synonyms_shown_in_glossary_capitalize_first_letter:
+        - Master chain code
+        - Master private key
+
+optional:
+    synonyms_and_pluralizations_not_shown_in_glossary:
+        - master chain codes
+        - master private keys
+
+    not_to_be_confused_with_capitalize_first_letter:
+
+    links_html_or_markdown_style_capitalize_first_letter:
+        - "[Master chain code](/en/developer-guide#term-master-chain-code) --- Bitcoin.org Developer Guide"
+        - "[Master private key](/en/developer-guide#term-master-private-key) --- Bitcoin.org Developer Guide"
+        - "[BIP32: hierarchical deterministic wallets](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki) --- Bitcoin Improvement Proposals"
+
+---