Added contributing and main README

CONTRIBUTING.md

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+# Contributing to LlamaIndex .NET
+
+## Issues
+
+Found bugs or have feature requests? File an issue.
+
+## Documentation & Samples
+
+We encourage community submitted samples. All of our samples are in the [samples](./samples/README.md) directory.
+
+To create new samples, submit a pull request.
+
+## Development
+
+### Project Structure
+
+- `LlamaIndex.Core`: Core types and abstractions for LlamaIndex.
+- `LlamaIndex.Core.Tests`: Unit tests for `LlamaIndex.Core`.  
+- `LlamaParse`: LlamaParse .NET client SDK
+- `LlamaParse.Test`: Unit tests for LlamaParse .NET client SDK
+
+### Configuration
+
+1. Install [.NET 8 SDK](https://dotnet.microsoft.com/download/dotnet/8.0)
+1. Install [Visual Studio](https://visualstudio.microsoft.com/downloads/) or [Visual Studio Code](https://code.visualstudio.com/Download)

README.md

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-# llamaindex.net
+# LlamaIndex.NET
-llamaindex interfaces for .net
+
+LlamaIndex.NET contains core types for working with LlamaIndex and client SDKs. 
+
+At this time, the following are supported:
+
+- LlamaParse client SDK for .NET
+
+## What is LlamaIndex?
+
+[LlamaIndex](https://llamaindex.ai/) is a data framework for LLM applications.
+
+[LlamaCloud](https://docs.llamaindex.ai/en/stable/llama_cloud/) is a managed platfor for data parsing and ingestion. It consists of the following components:
+
+- [**LlamaParse**](https://docs.llamaindex.ai/en/stable/llama_cloud/llama_parse/): self-serve document parsing API
+- **Ingestion and Retreival API**: Connect to 10+ data sources and sinks. Easily setup a data pipeline that can handle large volumes of data and incremental updates.
+- **Evaluations and observability**: Run and track evaluations on your data and model
+
+## Important Links
+
+- Documentation: [https://docs.llamaindex.ai/en/stable/](https://docs.llamaindex.ai/en/stable/)
+- Twitter: [https://twitter.com/llama_index](https://twitter.com/llama_index)
+- Discord: [https://discord.gg/dGcwcsnxhU](https://discord.gg/dGcwcsnxhU)
+
+## Contributing
+
+Interested in contributing? See our [Contribution Guide](./CONTRIBUTING.md) for more details.
+
+## Example Usage
+
+Install the LlamaParse .NET SDK.
+
+You can find samples in the [samples directory](./samples/README.md).
+
+### Parse documents using the LlamaParse .NET SDK
+
+```csharp
+using LlamaParse;
+
+// Initialize LlamaParse client
+var parseConfig = new Configuration
+{
+    ApiKey = "YOUR-API-KEY";
+};
+
+var client = new LlamaParseClient(new HttpClient(), parseConfig);
+
+// Get file info
+var fileInfo = new FileInfo("attention-is-all-you-need.pdf");
+
+// Parse document and format result as JSON
+var documents = new List<RawResult>();
+await foreach(var document in client.LoadDataRawAsync(fileInfo, ResultType.Json)
+    {
+        documents.Add(document);
+    }
+
+// Output to console
+foreach(var document in documents)
+{
+    Console.WriteLine(document);
+}
+```