Add basic class along with exception and attach

Signed-off-by: varun-r-mallya <varunrmallya@gmail.com>

src/core/bpf_exception.h

@@ -0,0 +1,16 @@
+#ifndef PYLIBBPF_BPF_EXCEPTION_H
+#define PYLIBBPF_BPF_EXCEPTION_H
+
+#include <stdexcept>
+#include <string>
+
+class BpfException final : public std::runtime_error {
+public:
+    explicit BpfException(const std::string& message)
+        : std::runtime_error(message) {}
+
+    explicit BpfException(const char* message)
+        : std::runtime_error(message) {}
+};
+
+#endif // PYLIBBPF_BPF_EXCEPTION_H