Basic resources added

- intro
- naming conventions
- access modifiers

src/content/resources/language/c-sharp/access-modifiers.md

@@ -0,0 +1,23 @@
+---
+authors:
+  - "Stone_Red#2890"
+created_at: 2021/08/07
+title: C#
+external_resources:
+  - text: Access Modifiers
+    href: "https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/access-modifiers"
+---
+
+## Availible access modifiers
+
+- **public:** The type or member can be accessed by any other code in the same assembly or another assembly that references it.
+- **private:** The type or member can be accessed only by code in the same class or struct.
+- **protected:** The type or member can be accessed only by code in the same class, or in a class that is derived from that class.
+- **internal:** The type or member can be accessed by any code in the same assembly, but not from another assembly.
+- **protected internal:** The type or member can be accessed by any code in the assembly in which it's declared, or from within a derived class in another assembly.
+- **private protected:** The type or member can be accessed only within its declaring assembly, by code in the same class or in a type that is derived from that class.
+
+## Why not use _public_ for everything?
+
+Access modifiers control where members can be accessed and seen.
+If you were to make everything _public_, anyone could access the member without restrictions and possibly change variables to undesired values or call methods that should only be called on certain events.