PRICE-1438: Add commitments resource examples for append mode (#661)

* PRICE-1438: Add commitments resource examples for append mode

* docs

---------

Co-authored-by: Michal Kopczynski <michal@cast.ai>

Author: michal-kopczynski

docs/resources/commitments.md

@@ -1,3 +1,4 @@
+# GCP example with default OVERWRITE mode and auto_assignment enabled (default)
 resource "castai_commitments" "gcp_test" {
   gcp_cuds_json = file("./cuds.json")
   commitment_configs {
@@ -20,6 +21,7 @@ resource "castai_commitments" "gcp_test" {
   }
 }
 
+# Azure example with default OVERWRITE mode and auto_assignment enabled (default)
 resource "castai_commitments" "azure_test" {
   azure_reservations_csv = file("./reservations.csv")
   commitment_configs {
@@ -41,3 +43,26 @@ resource "castai_commitments" "azure_test" {
     }
   }
 }
+
+# Azure example with APPEND mode and auto_assignment disabled to prevent commitments from being auto-assigned to all matching clusters.
+resource "castai_commitments" "team_a" {
+  azure_reservations_csv = file("./team-a-reservations.csv")
+  import_mode            = "APPEND"
+
+  commitment_configs {
+    matcher {
+      region = "eastus"
+      type   = "Standard_DS2_v2"
+      name   = "team-a-reservation"
+    }
+    prioritization   = false
+    allowed_usage    = 1
+    status           = "Active"
+    scaling_strategy = "Default"
+    auto_assignment  = false
+
+    assignments {
+      cluster_id = "team-a-cluster-id"
+    }
+  }
+}