Rename "intro" to "high-level" and "internals" to "low-level"

levels/low-level/blob-create

@@ -0,0 +1,38 @@
+[description]
+
+At its core, Git is very simple. It stores "objects", which are basically files identified by an "identifier" (short: ID).
+
+There are four types of objects: blobs, trees, commits, and tags. The simplest type is a "blob", which is just a piece of text.
+
+Let's create some blobs! To do that, create a file with the desired content, and then use
+
+    git hash-object -w <file>
+
+The flag -w means "write", and tells Git to actually write the new blob to the disk.
+
+Create three new blobs!
+
+[congrats]
+
+Tip: You can also use a command like this to create a blob in a single line:
+
+    echo "awesome content" | git hash-object -w --stdin
+
+Did you already notice that you can drag and drop all objects? :)
+
+[setup]
+
+[setup goal]
+
+echo "Hi" > file1
+echo "Ho" > file2
+echo "Hu" > file3
+git hash-object -w file1
+git hash-object -w file2
+git hash-object -w file3
+
+[win]
+
+BLOB_COUNT=$(git cat-file --batch-check='%(objectname) %(objecttype)' --batch-all-objects | grep blob | wc -l)
+
+test "$BLOB_COUNT" -gt 2