docs: added example package

Author: arteevraina

example_packages/cpp_files/README.md

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+# cpp_files
+My cool new project!

example_packages/cpp_files/fpm.toml

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+name = "cpp_files"
+version = "0.1.0"
+license = "license"
+author = "arteevraina"
+maintainer = "[email protected]"
+copyright = "Copyright 2022, arteevraina"
+[build]
+auto-executables = true
+auto-tests = true
+auto-examples = true
+[install]
+library = false

example_packages/cpp_files/src/cpp_files.f90

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+module cpp_files
+  use, intrinsic :: ISO_C_Binding
+  implicit none
+  private
+
+  public :: hello_world
+
+  interface
+    subroutine hello_world() bind(C, name = "hello_world")
+    end subroutine hello_world
+  end interface
+end module cpp_files

example_packages/cpp_files/src/hello_world.cpp

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+#include <iostream>
+
+extern "C" {
+  int hello_world();
+}
+
+int hello_world() {
+    std::cout << "Hello World";
+}

example_packages/cpp_files/test/check.f90

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+program check
+implicit none
+
+print *, "Put some tests in here!"
+end program check