List all the graph operations

docs/src/graph_op/README.md

@@ -1,2 +1,33 @@
 # Graph operations
 
+## Check
+
+Action name: `check`
+
+Runs AQL queries on the corpus and checks for constraints on the result.
+Can fail the workflow when one of the checks fail
+
+## Link nodes
+
+Action name: `linknodes`
+
+Created edges between nodes based on their annotation value.
+
+## Map annotations
+
+Action name: `mapannos`
+
+Creates new annotations based on existing annotation values.
+
+## Merge corpora
+
+Action name: `merge`
+
+Merge multiple imported corpora into one corpus.
+
+## Replace
+
+Action name: `re`
+
+Manipulate annotations, like deleting or renaming them.
+