Add documentatin to German vocabulary

README.md

@@ -24,8 +24,32 @@ vocabulary:
     declension/conjugation: string
 ```
 
-where the `conjugation` is the inflection paradigm for a German verb and `declension` the inflection for nouns and
+- The `conjugation` is the inflection paradigm for a German verb and `declension` the inflection for nouns and
 adjectives. Only one of the two is present for a term.
+- The type of the word can be inferred using the following rule
+
+  - `term` with a _definite article_ of "der"/"die"/"das" and a field of `plural` that comes with it signifies a
+    __noun__
+  - Those with `conjugation` field denotes a __verb__; its definition also begins with "to ..."
+  - The rests are explicitly stated in the `definition` field. For example,
+
+    ```yaml
+      - term: ob
+        definition:
+          - (conj.) if
+          - (conj.) whether
+    ```
+    
+    means "ob" is a **conjunction** in this case
+    
+    ```yaml
+      - term: denn
+        definition:
+          - (adv.) then, thus
+          - (conj.) because
+    ```
+    
+    tells that "denn" can be both an __adverb__ or __conjunction__
 
 ### [Korean](./korean.yaml)
 

german.yaml

@@ -774,6 +774,11 @@ vocabulary:
     definition:
       - (adv.) on the right
       - (adv.) to the right
+  - term: da
+    definition:
+      - (local) there; here
+      - (temporal) then
+      - (temporal) at that moment
   - term: die Erfahrung
     definition: experience
   - term: der Verletzter
@@ -949,6 +954,20 @@ vocabulary:
     declension: https://en.wiktionary.org/wiki/Ergebnis#Declension
   - term: führt zu keinem Ergebnis
     definition: leads to no result
+  - term: ob
+    definition:
+      - (conj.) if
+      - (conj.) whether
+  - term: wenn
+    definition:
+      - (conj.) when
+      - (conj.) if
+  - term: einwirken
+    definition: to affect
+    conjugation: https://en.wiktionary.org/wiki/einwirken#Conjugation
+  - term: können
+    definition: to be able to
+    conjugation: https://en.wiktionary.org/wiki/k%C3%B6nnen#Conjugation
   - term: rein
     definition: pure
   - term: die Vernunft