created the FindingHiddenVirtualFunctionPrototypes tip

Author: stephengaito

docs/TipsAndTricks/FindingHiddenVirtualFunctionPrototypes.md

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+# Finding hidden virtual function prototypes...
+
+## g++
+
+Make sure the `-Woverloaded-virtual` warnings are turned ON!
+
+## clang++
+
+Make sure the `-Woverloaded-virtual` warnings are turned ON!
+
+## clang-tidy
+
+Use **clang-tidy**:
+
+    clang-tidy -p build -header-filter=.* <<a compilation unit>>
+
+This will highlight *clang-diagnostic-overloaded-virtual* warnings.
+
+Consider adding the `cert-*` checks to check for CERT Secure Coding 
+Guidelines