[PATCH i-g-t v1] README: Document skip message format

[Sowmiya S <sowmiya.s@intel.com>]

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Add a concise guide for writing consistent, machine-friendly skip
messages in IGT tests. Defines the format:

  SKIP: <reason> [(<context_type>: <value>)]

along with common context types, example messages and a code snippet.

Signed-off-by: Sowmiya S <sowmiya.s@intel.com>
---
 README.md | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/README.md b/README.md
index b4b9a37ea..a652cc0d1 100644
--- a/README.md
+++ b/README.md
@@ -188,3 +188,40 @@ Imported non-DRM uapi headers from airlied's drm-next branch.
 
 Then, commit with a note of which exact commit from airlied's branch
 was used to generate them.
+
+Skip Message Format
+-------------------
+
+Keep skip messages consistent and machine-friendly. Use this concise
+format and include a single, most-relevant context when available:
+
+- Format: `SKIP: <reason> [(<context_type>: <value>)]` (always end with `\n`)
+- Rules: start with `SKIP:`, use a short lowercase `reason`, include at
+    most one `context` in parentheses, use `0x%llx` for modifiers, and
+    do not add a trailing period.
+
+### `Common context types and examples:`
+
+- `connector`: display connector name — `(connector: HDMI-A-1)`
+- `plane`: plane type — `(plane: primary)`
+- `format`: fourcc format — `(format: NV12)`
+- `modifier`: buffer modifier (hex) — `(modifier: 0x%llx)`
+- `pipe`: pipe id/name — `(pipe: A)`
+- `platform`: GPU/platform name — `(platform: i915)`
+
+### `Common concise messages:`
+
+- `SKIP: no suitable connector available`
+- `SKIP: connector is disconnected (connector: %s)`
+- `SKIP: no suitable display mode available (connector: %s)`
+- `SKIP: format not supported (plane: %s, format: %s)`
+- `SKIP: modifier not supported (modifier: 0x%llx)`
+- `SKIP: plane not available (plane: %s)`
+
+### `Example usage:`
+
+```c
+        igt_skip_on_f(!fmt_supported(plane, fmt),
+                            "SKIP: format not supported (plane: %s, format: %s)\n",
+                            igt_plane_name(plane), igt_format_str(fmt));
+```
-- 
2.43.0