Resolve "Implement Viper configuration"

Closes #6 (closed)

server/configs.go

+package server
+
+import (
+	"log"
+	"github.com/spf13/viper"
+)
+
+func SetConfigValues() {
+	// Set Default Values For Config Variables
+
+	// Vereign API Related
+	viper.SetDefault("grpcClientUrl", "localhost:7877")
+	viper.SetDefault("restClientUrl", "localhost:7878")
+	viper.SetDefault("dataStorageClientUrl", "localhost:7777")
+	
+	// Certificates Related
+	viper.SetDefault("certDir", "cert")
+	viper.SetDefault("certFile", "server.crt")
+	viper.SetDefault("certKey", "server.key")
+	viper.SetDefault("vereignCertFile", "vereign_ca.cer")
+	viper.SetDefault("vereignCertKey", "vereign_ca.key")
+
+	// Read Config File
+	viper.SetConfigName("config")
+	viper.AddConfigPath(".")
+	if err := viper.ReadInConfig(); err != nil {
+		log.Printf("can't read config: %s, will use default values", err)
+	}
+}
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