Add release note for v0.2.1

Signed-off-by: Gigon Bae <gbae@nvidia.com>

Author: gigony

docs/source/release_notes/index.md

@@ -11,6 +11,7 @@
 ```{toctree}
 :maxdepth: 1
 
+v0.2.1
 v0.2.0
 ```
 

docs/source/release_notes/v0.2.1.md

@@ -0,0 +1,26 @@
+# Version 0.2.1 (January 25, 2022)
+
+This is a patch release of [v0.2](https://docs.monai.io/projects/monai-deploy-app-sdk/en/latest/release_notes/v0.2.0.html#).
+
+Please visit [GETTING STARTED](/getting_started/index) guide and follow tutorials.
+
+You can learn more about SDK usage through [DEVELOPING WITH SDK](/developing_with_sdk/index).
+
+Please let us know how you like it and what could be improved by [submitting an issue](https://github.com/Project-MONAI/monai-deploy-app-sdk/issues/new/choose) or [asking questions](https://github.com/Project-MONAI/monai-deploy-app-sdk/discussions)😀
+
+## What's fixed/updated in this version 0.2.1
+
+- Fixed minor dependencies for fresh deployment [#208](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/208) by [@vikashg](https://github.com/vikashg)
+- Fix minor typo in chapter 4 notebook  documentation [#209](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/209) by [@KavinKrishnan](https://github.com/KavinKrishnan)
+- Bump numpy >= 1.20 to avoid MKL error in conda env, and add --upgrade for pip install app sdk [#211](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/211) by [@MMelQin](https://github.com/MMelQin)
+- Update notebooks with cloning repo and building MIS container [#214](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/214) by [@KavinKrishnan](https://github.com/KavinKrishnan)
+- Update notebooks with cloning repo and building MIS container documentation [#215](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/215) by [@KavinKrishnan](https://github.com/KavinKrishnan)
+- Change the model name in the Spleen seg example dataset to model.ts enhancement [#222](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/222) by [@MMelQin](https://github.com/MMelQin)
+- Remove developer names/aliases from notebooks and documentation bug documentation [#225](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/225) by [@KavinKrishnan](https://github.com/KavinKrishnan)
+- Fixed empty documentation on docs.monai documentation [#233](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/233) by [@vikashg](https://github.com/vikashg)
+- Handle exception case with missing DICOM Rescale Intercept and Slope attributes bug [#236](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/236) by [@MMelQin](https://github.com/MMelQin)
+- Fix IPython detection routine bug [#237](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/237) by [@gigony](https://github.com/gigony)
+- Use Python 3.7 for JupyterLab documentation [#241](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/241) by [@gigony](https://github.com/gigony)
+- Update gdown command and missing package documentation [#246](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/246) by [@gigony](https://github.com/gigony)
+- Do not upgrade packages when packaging bug [#247](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/247) by [@gigony](https://github.com/gigony)
+- Drop Python 3.6 support enhancement [#248](https://github.com/Project-MONAI/monai-deploy-app-sdk/pull/248) by [@gigony](https://github.com/gigony)