doc: Add comment about why Cargo.lock is ignored (maybe it is not obvious)

jhg · jhg · commit 40b8ec72cefe · 2020-12-25T03:12:45.000+01:00
diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,3 @@
 /target
+# This is a library (and it has not dependencies) then it is ignored:
 Cargo.lock

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`/target`
	`2`	`+# This is a library (and it has not dependencies) then it is ignored:`
`2`	`3`	`Cargo.lock`