Update instructions.md (#1444)

.github/copilot-instructions.md

@@ -1,4 +0,0 @@
-# Copilot Instructions
-
-## Project Guidelines
-- All new byte[xx] calls should use using var data = ArrayPool<byte>.Shared.Lease(xx); instead of directly allocating byte arrays

.github/instructions/instructions.md

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+---
+description: 'Guidelines for this solution'
+applyTo: '**/*.csproj, **/*.cs'
+---
+
+# Multi .NET Framework Targeting
+
+## Instructions
+- The main project "WireMock.Net.Minimal" targets `netstandard2.0` and `net8.0`. Ensure that any new code or dependencies are compatible with these frameworks.
+
+
+# C# Guidelines
+
+## Instructions
+- When a new ByteArray is needed, do not use `var data = new byte[bufferSize];`. Always use `var data = ArrayPool<byte>.Shared.Lease(bufferSize);`.