Update tech_docs/networking/iac_github_project.md

tech_docs/networking/iac_github_project.md

@@ -1,3 +1,65 @@
+Here’s a one-page cheat-sheet you can tape to your monitor.  
+It distills the whole document into three things you actually touch every day.
+
+────────────────────────────────────────
+1. Daily Workflow (30 s)
+────────────────────────────────────────
+$ make check   # lint + schema + dry-run render
+$ git add data/site-03.yml
+$ git commit -m "Add Denver hub"
+
+That’s it.  
+CI does the rest: renders, diffs, pushes to Nornir.
+
+────────────────────────────────────────
+2. YAML Skeleton (copy-paste starter)
+────────────────────────────────────────
+# data/site-XYZ.yml
+hostname:                 "XYZ-ASR01"
+license_level:            "network-advantage"
+domain_name:              "corp.example"
+name_servers:             ["1.1.1.1", "8.8.8.8"]
+tz_name:                  "EST"
+tz_offset:                -5
+tacacs_group:             "GTAC"
+tacacs_servers:
+  - { host: 10.10.10.1, key: "{{ vault_tacacs_key1 }}" }
+  - { host: 10.10.10.2, key: "{{ vault_tacacs_key2 }}" }
+
+interfaces:
+  Loopback0:   { ip: "10.255.255.X/32" }
+  Tunnel100:
+    ip: "10.200.100.1/24"
+    tunnel_source: "Loopback0"
+routing:
+  ospf:
+    - pid: 1, rid: "10.255.255.X"
+  bgp:
+    as: 65400, rid: "10.255.255.X"
+qos: {}   # leave empty if no QoS yet
+acls: []
+
+────────────────────────────────────────
+3. Quick Overrides
+────────────────────────────────────────
+Need a one-off value?  
+Put it in the same YAML; deep-merge guarantees it wins over defaults.
+
+Example:
+qos:
+  policy_maps:
+    - name: "WAN-OUT"
+      classes:
+        - name: "VOICE"
+          actions:
+            - { cmd: "priority percent", value: 10 }
+
+────────────────────────────────────────
+Remember  
+“Templates are frozen; YAML is the only thing that changes.”
+
+---
+
 ```plaintext
 ────────────────────────────────────────────
 OPINIONATED, PRACTICAL GUIDE