Implement extraction command

Requires !9 (merged)

Closes #9 (closed)

README.md

@@ -125,22 +125,22 @@ INTITULE:
   start: ⓘ
   end: Ⓘ
 DATE:
-  start: ⓘ
+  start: ⓓ
   end: Ⓓ
 COTE_SERIE:
-  start: ⓘ
+  start: ⓢ
   end: Ⓢ
 ANALYSE_COMPL.:
-  start: ⓘ
+  start: ⓒ
   end: Ⓒ
 PRECISIONS_SUR_COTE:
-  start: ⓘ
+  start: ⓟ
   end: Ⓟ
 COTE_ARTICLE:
-  start: ⓘ
+  start: ⓐ
   end: Ⓐ
 CLASSEMENT:
-  start: ⓘ
+  start: ⓛ
   end: Ⓛ
 ```