docs: autocrlf on windows

README.md

@@ -29,9 +29,11 @@ Configure a repository to use git-crypt:
 
 Specify files to encrypt by creating a .gitattributes file:
 
-    secretfile filter=git-crypt diff=git-crypt
-    *.key filter=git-crypt diff=git-crypt
-    secretdir/** filter=git-crypt diff=git-crypt
+    secretfile eol=lf filter=git-crypt diff=git-crypt
+    *.key eol=lf filter=git-crypt diff=git-crypt
+    secretdir/** eol=lf filter=git-crypt diff=git-crypt
+
+***eol=lf settings is necessary if autocrlf is true.***
 
 Like a .gitignore file, it can match wildcards and should be checked into
 the repository.  See below for more information about .gitattributes.
@@ -40,6 +42,9 @@ Make sure you don't accidentally encrypt the .gitattributes file itself
 .gitattributes rules are in place *before* you add sensitive files, or
 those files won't be encrypted!
 
+***IF `core.autocrlf` is true (which is recommended in Windows), it will throw an error like `git-crypt: error: encrypted file has been tampered with!`
+To avoid this, use `eol=lf` in .gitattributes for the secrets.***
+
 Share the repository with others (or with yourself) using GPG:
 
     git-crypt add-gpg-user USER_ID