feat(project): Initialize UR16e pick and place project

[henry2craftman]

Proposed change(s)

Description

This PR establishes the initial framework for the UR16e Pick and
Place project within the ML-Agents repository. It introduces the
core components required to train a UR16e robotic arm for a
pick-and-place task using reinforcement learning.

Key Changes

• 🤖 Agent Implementation (UR16Agent.cs): A new agent script has
  been added to manage the robot's learning process. It defines
  the state observations, action space, and reward function
  tailored for the pick-and-place task.
• 🛠️ Unity Environment (UR16 agents.unity): A dedicated Unity
  scene is included, featuring the UR16e robot, the target object,
  and the necessary ML-Agents components for training and
  inference.
• 📚 Documentation (README.md, README.ko.md): Comprehensive
  documentation has been added in both English and Korean. The
  READMEs explain the project's purpose, structure, and provide
  clear instructions on how to get started and run the simulation.

Purpose

The goal of this PR is to formally initialize the project and
provide a solid foundation for future development and
experimentation with the UR16e robot. By adding the core logic
and documentation upfront, it makes the project accessible and
understandable for other contributors.

How to Test

1. Clone the branch.
2. Open the project in Unity Editor (version 6000.0.42f1 or
   compatible).
3. Open the Assets/UR16 agents.unity scene.
4. Enter Play mode to run the simulation.
5. Verify that the agent and environment are loaded correctly and the simulation runs without errors.
6. (Optional) Review the code in UR16Agent.cs and the content of
   the new README files.

Vidoes

Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Breaking change
• Documentation update
• Other (please describe)

Checklist

• Added tests that prove my fix is effective or that my feature works
• Updated the changelog (if applicable)
• Updated the documentation (if applicable)
• Updated the migration guide (if applicable)

Other comments

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