Add PoseRenderer.mod for Maya module installs

Registers the module as PoseRenderer 1.0.0, auto-adding plug-ins/ to
MAYA_PLUG_IN_PATH and python/ to PYTHONPATH. Verified end-to-end
(module discovery, load-by-short-name, python/ on sys.path,
functional smoke test) on both Maya 2022 and 2024. README documents
this as the recommended install path, with the plain
MAYA_PLUG_IN_PATH route kept as a fallback.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

PoseRenderer.mod

@@ -0,0 +1,2 @@
++ PoseRenderer 1.0.0 .
+PYTHONPATH+:=python

README.md

@@ -14,16 +14,30 @@ the exact same joint mapping; switching formats does not require remapping.
 
 ## Install
 
-1. Copy (or symlink) this whole `PoseRenderer` folder somewhere on disk.
+**Option A -- Maya module (recommended):** copy (or symlink) this whole
-2. Add its `plug-ins` folder to `MAYA_PLUG_IN_PATH`, e.g. in
+`PoseRenderer` folder somewhere on disk, then add its *parent* directory to
-   `Maya.env`:
+`MAYA_MODULE_PATH` (e.g. in `Maya.env`):
-   ```
+```
-   MAYA_PLUG_IN_PATH = C:\path\to\PoseRenderer\plug-ins
+MAYA_MODULE_PATH = C:\path\to\parent\folder
-   ```
+```
-   (The plugin adds its own `python/` folder to `sys.path` automatically at
+`PoseRenderer.mod` (at the repo root) handles the rest: it registers the
-   load time -- you do not need to set `PYTHONPATH` yourself.)
+module as `PoseRenderer`, adds `plug-ins/` to `MAYA_PLUG_IN_PATH` and
-3. In Maya: **Windows > Settings/Preferences > Plug-in Manager**, find
+`python/` to `PYTHONPATH` automatically. In Maya: **Windows >
-   `openposeRenderer.py`, and check *Loaded* (and *Auto load* if desired).
+Settings/Preferences > Plug-in Manager**, find `openposeRenderer.py`, and
+check *Loaded* (and *Auto load* if desired) -- it's now loadable by its
+short name (`cmds.loadPlugin("openposeRenderer")`) from anywhere.
+
+**Option B -- plug-in path only:** skip the module system and add
+`plug-ins/` directly to `MAYA_PLUG_IN_PATH` instead:
+```
+MAYA_PLUG_IN_PATH = C:\path\to\PoseRenderer\plug-ins
+```
+The plugin adds its own `python/` folder to `sys.path` automatically at
+load time either way (via `MFnPlugin.loadPath()`), so `PYTHONPATH` never
+needs setting by hand for the plugin itself to work -- Option A's
+`PYTHONPATH` entry only matters if you want `python/openpose_renderer` (or
+the bundled `debugpy`) importable outside of loading the plugin, e.g. from
+a shelf script.
 
 ## Usage