Add DB system requirement research.

Config/WordpressExample/env.main

@@ -12,24 +12,24 @@ MYSQL_RANDOM_ROOT_PASSWORD=1
 ## Performance ##
 # Standard Minimum
 #WP_CPU=1.00
-#WP_MEM=2.0G
-#WP_CPU_DB=
-#WP_MEM_DB=
+#WP_MEM=2.00G
+#WP_CPU_DB=1.00
+#WP_MEM_DB=1.00G
 
 # Standard Recommended
 #WP_CPU=1.00
-#WP_MEM=4.0G
-#WP_CPU_DB=
-#WP_MEM_DB=
+#WP_MEM=4.00G
+#WP_CPU_DB=1.00
+#WP_MEM_DB=0.50G
 
-# tested Minimum
-#WP_CPU=
-#WP_MEM=
-#WP_CPU_DB=
-#WP_MEM_DB=
+# Tested Minimum
+#WP_CPU=0.50
+#WP_MEM=0.50G
+#WP_CPU_DB=0.10
+#WP_MEM_DB=0.10G
 
 # Tested Recommended
-WP_CPU=
-WP_MEM=
-WP_CPU_DB=
-WP_MEM_DB=
+#WP_CPU=1.00
+#WP_MEM=1.00G
+#WP_CPU_DB=0.25
+#WP_MEM_DB=0.25G