Enhance README

README.md

@@ -4,6 +4,29 @@ Wilhelm Vocabulary
 [![GitHub workflow status badge][GitHub workflow status badge]][GitHub workflow status URL]
 [![Apache License Badge]][Apache License, Version 2.0]
 
+<!-- TOC -->
+- [Wilhelm Vocabulary](#wilhelm-vocabulary)
+  - [Data Format](#data-format)
+  - [How Data (Vocabulary) is Stored in a Graph Database](#how-data-vocabulary-is-stored-in-a-graph-database)
+    - [Why Graph Database](#why-graph-database)
+    - [Definition](#definition)
+    - [Inflections](#inflections)
+  - [Languages](#languages)
+    - [German](#german)
+      - [YAML Schema](#yaml-schema)
+      - [German Declension](#german-declension)
+        - [Noun Declension Templates](#noun-declension-templates)
+          - [Masculine](#masculine)
+          - [Neuter](#neuter)
+        - [German (Attributive) Adjective Declension](#german-attributive-adjective-declension)
+      - [German Conjugation](#german-conjugation)
+    - [Ancient Greek](#ancient-greek)
+    - [Latin](#latin)
+    - [Classical Hebrew (Coming Soon)](#classical-hebrew-coming-soon)
+    - [Korean](#korean)
+  - [License](#license)
+<!-- TOC -->
+
 Data Format
 -----------
 
@@ -19,10 +42,10 @@ How Data (Vocabulary) is Stored in a Graph Database
 ### Why Graph Database
 
 Graph data representation assumes universal connectivity among world entities. This applies pretty well to the realm of
-languages. Multilanguage learners have already seen that Indo-European languages are similar in many different ways.
-The similarities not only signify the historical facts about Philology but also surface a great opportunity for
+languages. Multilanguage learners have already seen that Indo-European languages are similar in many respects. The
+similarities not only signify the historical facts about Philology but also surface a great opportunity for
 multilanguage learners to study much more efficiently. What's missing is connecting the dots using Graph Databases that
-visually presents these vastly enlightening links between the related languages.
+visually presents these vastly enlightening links between the related languages very naturally.
 
 ### Definition
 
@@ -35,10 +58,20 @@ the German noun "[Ecke](https://en.wiktionary.org/wiki/Ecke#Noun)" has at least
     Graph data generated by <a href="https://github.com/QubitPi/wilhelm-python-sdk">wilhelm-python-sdk</a>
 </div>
 
-[German](./german.yaml)
------------------------
+### Inflections
+
+Indo-European languages are mostly inflected. The way inflections are encoded are documented for each language
+separately:
+
+- [German declension](#german-declension)
+- [German conjugation](#german-conjugation)
+
+Languages
+---------
+
+### [German](./german.yaml)
 
-### YAML Schema
+#### YAML Schema
 
 ```yaml
 vocabulary:
@@ -110,9 +143,10 @@ vocabulary:
 > __Visualzing synonyms this way presents a big advantage to human brain__ who is exceedingly good at memorizing
 > patterns
 
-### German Noun Declension
+#### German Declension
 
-The declension table employees an [application-specific YAML](https://stackoverflow.com/q/30894438/14312712) that looks like the following:
+The declension table employees an [application-specific YAML](https://stackoverflow.com/q/30894438/14312712) that looks
+like the following:
 
 ```yaml
   - term: ein
@@ -145,9 +179,9 @@ The declension table above is equivalent to
 > __The declension tables for all nouns are sourced from
 > [Wiktionary](https://en.wiktionary.org/wiki/ein#Declension_2)__
 
-#### Noun Declension Templates
+##### Noun Declension Templates
 
-##### Masculine
+###### Masculine
 
 ```yaml
     declension:
@@ -159,7 +193,7 @@ The declension table above is equivalent to
       - [accusative, einen,    den,      ████████, die,    ██████]
 ```
 
-##### Neuter
+###### Neuter
 
 ```yaml
     declension:
@@ -171,7 +205,7 @@ The declension table above is equivalent to
       - [accusative, ein,      das,      ████████, die,    ██████]
 ```
 
-### German (Attributive) Adjective Declension
+##### German (Attributive) Adjective Declension
 
 > [!TIP]
 >
@@ -255,7 +289,7 @@ Here is an example of the adjective declension for
 > __The declension tables for all adjectives are sourced from
 > [Wiktionary](https://en.wiktionary.org/wiki/unterschiedlich#Declension)__
 
-### German Verb Conjugation
+#### German Conjugation
 
 There are __3__ persons, __2__ numbers, and __4__ moods (indicative, conditional, imperative and subjunctive) to
 consider in conjugation. There are __6__ tenses in German: the present and past are conjugated, and there are four
@@ -307,8 +341,7 @@ with
 >   instead. This is why we left the conjugation link to Wiktionary for now and it will definitely serve us well as I'm
 >   trying to make it happen
 
-[Ancient Greek](./greek.yaml)
------------------------------
+### [Ancient Greek](./greek.yaml)
 
 ```yaml
 vocabulary:
@@ -321,8 +354,7 @@ although [some words are missing the audio](https://en.wiktionary.org/wiki/%CE%B
 scarcity of the audio resources among AG lerners, [a separate project](https://github.com/QubitPi/ancient-greek-reader)
 has been initiated to expand the audio practice materials by AI
 
-[Latin](./latin.yaml)
----------------------
+### [Latin](./latin.yaml)
 
 ```yaml
 vocabulary:
@@ -330,14 +362,12 @@ vocabulary:
     definition: list
 ```
 
-Classical Hebrew (Coming Soon)
-------------------------------
+### Classical Hebrew (Coming Soon)
 
 The vocabulary is presented to help read and understand [Biblical Hebrew](https://mechon-mamre.org/p/pt/pt00.htm#mp3). A
 [complementary audio](https://mechon-mamre.org/p/pt/ptmp3prq.htm) helps well with the pronunciation.
 
-[Korean](./korean.yaml)
------------------------
+### [Korean](./korean.yaml)
 
 中国人学习韩语有先天优势，加之韩语本身也是一门相当简单的语言，所以这里将语法和词汇合并在一起；
 每一项也只由 `term`（韩）和 `definition`（中）组成，