adding new stuff

plugins/bundle/xptemplate/doc/xpt/indent.md

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+
+-   4-space indent:
+    Used in snippet file.
+    Consistent with different 'tabstop', 'shiftwidth' setting.
+
+-   tab indent:
+    Used internally in XPTemplate.
+    Produced by converting 4 leading space to one tab.
+
+    These two above are VIM setting irrelavent. Snippet file can use either of
+    them, but 4-space indent is recommended.
+
+-   space indent:
+    Produced by expanding a `tab` char to `&shiftwidth` spaces.
+    These spaces occupies the same room as actual indent.
+    This is the second last step before putting text onto screen.
+
+    space indent texts are used internally.
+    Wrapped text is passing through in this style.
+
+-   actual indent:
+    Produced by convert `&tabstop` space to one tab if 'expandtab' not set.
+    This is the actual indent
+
+    The last two are VIM setting relavent.