Add course directory manifest and upload notes

.gitattributes

@@ -1,7 +1,3 @@
-
-# Upload-only course archive
-* filter=lfs diff=lfs merge=lfs -text
-.gitattributes -filter -diff -merge text
-README.md -filter -diff -merge text
-_course_archive/Computer-Architecture-70/directory-structure.json -filter -diff -merge text
-_course_archive/Computer-Architecture-70/README.md -filter -diff -merge text
+version https://git-lfs.github.com/spec/v1
+oid sha256:2d5f03d5a93e885a63b1b3abb523b3e6fcb8730cb40fc93c42c1d7056ef8d35c
+size 321

README.md

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8600c9333b147da078d0fef5a4baa2e88c25b132c74962e6c87b11ba624962ea
+size 435

_course_archive/Computer-Architecture-70/directory-structure.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1221feafbd56a0470bdb365431df871bddb3f769c95a5bc2b0c5cdb40269c283
+size 2937