Added issue templates for MP Preview.

PiperOrigin-RevId: 493389856

mediapipe/opensource_only/ISSUE_TEMPLATE/11-tasks-issue.md

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+---
+name: "Tasks Issue"
+about: Use this template for assistance with a specific task, such as "Gesture Recognition" or "Object Detection", including inference model usage/training etc.
+labels: type:support
+
+---
+<em>Please make sure that this is a [Tasks](https://developers.google.com/mediapipe/solutions) issue.<em>
+
+**System information** (Please provide as much relevant information as possible)
+- Have I written custom code (as opposed to using a stock example script provided in MediaPipe):
+- OS Platform and Distribution (e.g., Linux Ubuntu 16.04, Android 11, iOS 14.4):
+- MediaPipe Tasks SDK version:
+- Task name (e.g. Object detection, Gesture recognition etc.):
+- Programming Language and version ( e.g. C++, Python, Java):
+
+**Describe the expected behavior:**
+
+**Standalone code you may have used to try to get what you need :**
+
+If there is a problem, provide a reproducible test case that is the bare minimum necessary to generate the problem. If possible, please share a link to Colab, GitHub repo link or anything that we can use to reproduce the problem:
+
+**Other info / Complete Logs :**
+Include any logs or source code that would be helpful to
+diagnose the problem. If including tracebacks, please include the full
+traceback. Large logs and files should be attached:

mediapipe/opensource_only/ISSUE_TEMPLATE/12-model-maker-issue.md

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+---
+name: "Model Maker Issue"
+about: Use this template for assistance with a specific task, such as "Gesture Recognition" or "Object Detection", including inference model usage/training etc.
+labels: type:support
+
+---
+<em>Please make sure that this is a [Model Maker](https://developers.google.com/mediapipe/solutions) issue.<em>
+
+**System information** (Please provide as much relevant information as possible)
+- Have I written custom code (as opposed to using a stock example script provided in MediaPipe):
+- OS Platform and Distribution (e.g., Linux Ubuntu 16.04):
+- Python version (e.g. 3.8):
+- [MediaPipe Model Maker version](https://pypi.org/project/mediapipe-model-maker/):
+- Task name (e.g. Image classification, Gesture recognition etc.):
+
+**Describe the expected behavior:**
+
+**Standalone code you may have used to try to get what you need :**
+
+If there is a problem, provide a reproducible test case that is the bare minimum necessary to generate the problem. If possible, please share a link to Colab, GitHub repo link or anything that we can use to reproduce the problem:
+
+**Other info / Complete Logs :**
+Include any logs or source code that would be helpful to
+diagnose the problem. If including tracebacks, please include the full
+traceback. Large logs and files should be attached: