.Net: ADR Samples Contribution Guidelines (#10526)

### Motivation and Context

- Partially Resolves #10168

docs/decisions/0066-concepts-guidelines.md

@@ -0,0 +1,93 @@
+---
+# These are optional elements. Feel free to remove any of them.
+status: proposed
+contact: rogerbarreto
+date: 2025-02-11
+deciders: markwallace, sergey, dmytro, weslie, evan, shawn
+---
+
+# Structured Concepts
+
+## Context and Problem Statement
+
+Currently, the Concepts project has grown considerably, with many samples that do not consistently follow a structured pattern or guideline.
+
+A revisit of our sample patterns in favor of key drivers needs to be considered.
+
+This ADR starts by suggesting rules we might follow to keep new concepts following good patterns that make them easy to comprehend, find, and descriptive.
+
+The Semantic Kernel audience can vary greatly—from pro-devs, beginners, and non-developers. We understand that making sure examples and guidelines are as straightforward as possible is of our highest priority.
+
+### Decision Drivers
+
+- Easy to find
+- Easy to understand
+- Easy to set up
+- Easy to execute
+
+The above drivers focus on ensuring that we follow good practices, patterns, and a structure for our samples, guaranteeing proper documentation, simplification of code for easier understanding, as well as the usage of descriptive classes, methods, and variables.
+
+We also understand how important it is to ensure our samples are copy-and-paste friendly (work "as is"), being as frictionless as possible.
+
+## Solution
+
+Applying a set of easy-to-follow guidelines and good practices to the Concepts project will help maintain a good collection of samples that are easy to find, understand, set up, and execute.
+
+This guideline will be applied for any maintenance or newly added samples to the Concepts project. The contents may be added to a new CONTRIBUTING.md file in the Concepts project.
+
+> [!NOTE]
+> Rules/Conventions that are already ensured by analyzers are not mentioned in the list below.
+
+## Rules
+
+### Sample Classes
+
+Each class in the Concepts project MUST have an xmldoc description of what is being sampled, with clear information on what is being sampled.
+
+✅ DO have xmldoc description detailing what is being sampled.
+
+✅ DO have xmldoc remarks for the required packages.
+
+✅ CONSIDER using xmldoc remarks for additional information.
+
+❌ AVOID using generic descriptions.
+
+✅ DO name classes with at least two words, separated by an underscore `First_Second_Third_Fourth`.
+
+✅ DO name classes with the `First` word reserved for the given concept or provider name (e.g., `OpenAI_ChatCompletion`).
+
+When the file has examples for a specific `<provider>`, it should start with the `<provider>` as the first word. `<provider>` here can also include runtime, platform, protocol, or service names.
+
+✅ CONSIDER naming `Second` and later words to create the best grouping for examples,  
+e.g., `AzureAISearch_VectorStore_ConsumeFromMemoryStore`.
+
+✅ CONSIDER naming when there are more than two words, using a left-to-right grouping,  
+e.g., `AzureAISearch_VectorStore_ConsumeFromMemoryStore`: for `AzureAISearch` within `VectorStore` grouping, there's a `ConsumeFromMemoryStore` example.
+
+### Sample Methods
+
+✅ DO have an xmldoc description detailing what is being sampled when the class has more than one sample method.
+
+✅ DO have descriptive method names limited to five words, separated by an underscore,  
+e.g., `[Fact] public Task First_Second_Third_Fourth_Fifth()`.
+
+❌ DO NOT use `Async` suffix for Tasks.
+
+❌ AVOID using parameters in the method signature.
+
+❌ DO NOT have more than 3 samples in a single class. Split the samples into multiple classes when needed.
+
+### Code
+
+✅ DO keep code clear and concise. For the most part, variable names and APIs should be self-explanatory.
+
+✅ CONSIDER commenting the code for large sample methods.
+
+❌ DO NOT use acronyms or short names for variables, methods, or classes.
+
+❌ AVOID any references to common helper classes or methods that are not part of the sample file,  
+e.g., avoid methods like `BaseTest.OutputLastMessage`.
+
+## Decision Outcome
+
+TBD