Added Assignment 3 worksheet and code

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diff --git a/dev/a3-earthquake/earthquake_database.h b/dev/a3-earthquake/earthquake_database.h
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+/** CSci-4611 Assignment 3:  Earthquake
+ */
+
+#ifndef EARTHQUAKEDATABASE_H_
+#define EARTHQUAKEDATABASE_H_
+
+#include <string>
+#include <vector>
+
+#include "earthquake.h"
+#include "date.h"
+
+/** A database of earthquakes created by loading from a data file.
+ */
+class EarthquakeDatabase {
+public:
+    /// Creates an empty EarthquakeDatabase
+    EarthquakeDatabase() {}
+
+    /// Creates an EarthquakeDatabase from file
+    EarthquakeDatabase(std::string filename);
+
+    /// Returns the index of the most recent earthquake as of given date
+    int FindMostRecentQuake(Date d);
+
+    /// Returns Earthquake given index in file
+    Earthquake earthquake(int index);
+
+    /// Returns minimum index.  Note that this is not zero!
+    int min_index();
+
+    /// Returns maximum valid index.  Running
+    /// getByIndex(getMaxIndex()) WILL return the last earthquake in the file
+    int max_index();
+
+    /// Returns the magnitude of the earthquake with the largest magnitude
+    /// in the database
+    float max_magnitude();
+    
+    /// Returns the magnitude of the earthquake with the smallest magnitude
+    /// in the database
+    float min_magnitude();
+
+protected:
+    std::vector<Earthquake> earthquakes;
+    float min_mag_;
+    float max_mag_;
+};
+
+#endif