adding new source material

LectureCodeExamples/HTTP/cookies/example_01/main.go

LectureCodeExamples/HTTP/cookies/example_02/main.go

LectureCodeExamples/HTTP/middleware/example_01/main

LectureCodeExamples/HTTP/middleware/example_01/main.go

LectureCodeExamples/HTTP/middleware/example_01/server

LectureCodeExamples/HTTP/middleware/example_02/main

LectureCodeExamples/HTTP/middleware/example_02/main.go

LectureCodeExamples/HTTP/middleware/example_03/main.go

LectureCodeExamples/HTTP/requests/example_01/main

LectureCodeExamples/HTTP/requests/example_01/main.go

LectureCodeExamples/HTTP/requests/example_02/main.go

LectureCodeExamples/HTTP/requests/example_02a/main.go

LectureCodeExamples/HTTP/requests/example_03/main.go

LectureCodeExamples/HTTP/server/example_01/main

LectureCodeExamples/HTTP/server/example_01/main.go

LectureCodeExamples/HTTP/server/example_02/main.go

LectureCodeExamples/HTTP/server/example_03/main.go

LectureCodeExamples/HTTP/server/example_03/server

...deExamples/data_transfer_encodings/csv/example_01/main.go

...deExamples/data_transfer_encodings/csv/example_02/main.go