Employment in Rutherford County is about to get a big shot in the arm. Murfreesboro's The Daily News Journal reports that an unnamed advanced manufacturing company will invest $100 million to create 1,000 jobs in Smyrna. Rutherford County Chamber of Commerce President Paul Latture disclosed the investment, codenamed Project Cedar, during a special called meeting of the county's Industrial Development Board Monday morning. Latture said the average salary of the positions is $38,000, about $10,000…