[Term Entry] C++ Sets: max_size()

* Add max_size.md term entry for C++ Sets with description, syntax, example, and codebyte

* correctly changed file-location from sets/max_size/max_size.md -> max_size/max_size.md

* content tweak and changed file name

* Update max-size.md

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Author: hevolx

content/cpp/concepts/sets/terms/max-size/max-size.md

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+---
+Title: 'max_size()'
+Description: 'Returns the maximum number of elements the set can hold.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Functions'
+  - 'Sets'
+  - 'STL'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+**`max_size()`** is a member function of C++ containers like `std::set` that returns the maximum number of elements the container can hold, based on the system or allocator limitations. It does not reflect the current size, but the theoretical upper bound.
+
+## Syntax
+
+```pseudo
+set_name.max_size()
+```
+
+**Parameters:**
+
+This function does not take any parameters.
+
+**Return value:**
+
+Returns an integral value of type `size_type` (usually `std::size_t`) representing the maximum number of elements the set can theoretically contain, based on system or allocator limitations.
+
+## Example: Using `max_size()` with `std::set`
+
+This code checks the maximum number of elements a `std::set` can theoretically hold, depending on system and allocator limits:
+
+```cpp
+#include <iostream>
+#include <set>
+
+int main() {
+  std::set<int> mySet;
+  std::cout << "Maximum size of the set: " << mySet.max_size() << std::endl;
+  return 0;
+}
+```
+
+The possible output of this code is:
+
+```shell
+Maximum size of the set: 4611686018427387903
+```
+
+> **Note:** The actual result may vary by system and compiler.
+
+## Codebyte Example: Using `max_size()` with `std::set<std::string>`
+
+Here is a runnable codebyte example that demonstrates how to use `max_size()` with a `std::set<std::string>` to check its theoretical capacity:
+
+```codebyte/cpp
+#include <iostream>
+#include <set>
+#include <string>
+
+int main() {
+  std::set<std::string> stringSet;
+  std::cout << "Maximum size of the string set: " << stringSet.max_size() << std::endl;
+  return 0;
+}
+```