Add Tabby example (#62)

* Add Tabby example

* add README

* minor update

advanced/tabbyml/README.md

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+# Tabby
+
+[Tabby](https://github.com/TabbyML/tabby) is an AI coding assistant, offering an open-source and on-premises alternative to GitHub Copilot.
+
+## Install Lepton sdk
+```shell
+pip install leptonai
+```
+
+## Launch Tabby in the cloud
+
+Similar to other examples, you can run Tabby on Lepton Cloud Platform easily, e.g.:
+
+```shell
+lep photon create -n tabby -m photon.py
+lep photon push -n tabby
+lep photon run \
+    -n tabby \
+    --resource-shape gpu.a10
+    --public
+```
+
+You can visit [dashboard.lepton.ai](https://dashboard.lepton.ai/) to use the web Dashboard, or use `lep` cli to manage the launched deployment:
+```shell
+lep deployment status -n tabby
+```
+
+You can configure the underlying model (default `TabbyML/StarCoder-1B`) with the `MODEL` environment variable, e.g. to switch to use `TabbyML/DeepseekCoder-1.3B`:
+
+```shell
+lep photon run \
+    -n tabby- \
+    -e TabbyML/DeepseekCoder-1.3B
+    --resource-shape gpu.a10
+    --public
+```
+
+## Client
+
+Once the Tabby server is up, you can use the deployment url shown on the Lepton Dashboard (or in the `lep` cli output)
+
+<img src="assets/deployment.png" width=1024>
+
+as API Endpoint of Tabby, to configure the supported [IDE extensions](https://tabby.tabbyml.com/docs/extensions). e.g. In VSCode:
+
+<img src="assets/vscode.png" width=1024>
+
+and start coding with the power of AI!
+
+<img src="assets/coding.png" width=1024>

advanced/tabbyml/photon.py

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+import os
+
+from leptonai.photon import Photon
+
+
+class TabbyML(Photon):
+    image: str = "tabbyml/tabby"
+    cmd = [
+        "/opt/tabby/bin/tabby",
+        "serve",
+        "--model",
+        os.environ.get("MODEL", "TabbyML/StarCoder-1B"),
+        "--port",
+        "8080",
+        "--device",
+        os.environ.get("DEVICE", "cuda"),
+    ]
+
+    deployment_template = {
+        "resource_shape": "gpu.a10",
+        "env": {
+            "MODEL": "TabbyML/StarCoder-1B",
+        },
+        "secret": [
+            "HUGGING_FACE_HUB_TOKEN",
+        ],
+    }