Created the file for private access modifier

content/cpp/concepts/access-modifiers/terms/private/private.md

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+---
+Title: 'Private Access Modifiers'
+Description: 'Specifies that class members are only accessible from within the class itself.'
+Subjects:
+  - 'Computer Science'
+Tags:
+  - 'Classes'
+  - 'Access Modifiers'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+In C++, the **`private`** keyword keeps class members hidden. This means that only the methods within the same class can access these members. Objects of the class and functions outside the class **cannot** access them directly.
+
+## Syntax
+
+```pseudo
+class ClassName {
+private:
+  // Private members
+};
+```
+
+## Example
+
+In the example below, attempting to directly access the `private` data member `secretVar` from outside the class would result in a compilation error:
+
+```cpp
+#include <iostream>
+
+class Secret {
+private:
+  // Private member variable
+  int secretVar;
+
+public:
+  // Public member function to set the private variable
+  void setSecret(int value) {
+    secretVar = value;
+  }
+
+  // Public member function to reveal the private variable
+  int revealSecret() {
+    return secretVar;
+  }
+};
+
+int main() {
+  Secret mySecret;
+
+  // Throws an error
+  // mySecret.secretVar = 10;
+  // Error: secretVar is private
+
+  // Use public function to set the value
+  mySecret.setSecret(10);
+  // Use public function to get the value
+  std::cout << mySecret.revealSecret();
+
+  return 0;
+}
+```
+
+The above code will give the following output:
+
+```shell
+10
+```