add: border-top.md border-bottom.md border-left.md border-right.md

docs/uni-app-x/css/border-bottom.md

+## border-bottom
+
+
+<!-- CSSJSON.border-bottom.description -->
+
+<!-- CSSJSON.border-bottom.syntax -->
+
+<!-- CSSJSON.border-bottom.values -->
+
+<!-- CSSJSON.border-bottom.compatibility -->
+
+<!-- CSSJSON.border-bottom.reference -->
\ No newline at end of file

docs/uni-app-x/css/border-left.md

+## border-left
+
+
+<!-- CSSJSON.border-left.description -->
+
+<!-- CSSJSON.border-left.syntax -->
+
+<!-- CSSJSON.border-left.values -->
+
+<!-- CSSJSON.border-left.compatibility -->
+
+<!-- CSSJSON.border-left.reference -->
\ No newline at end of file

docs/uni-app-x/css/border-right.md

+## border-right
+
+
+<!-- CSSJSON.border-right.description -->
+
+<!-- CSSJSON.border-right.syntax -->
+
+<!-- CSSJSON.border-right.values -->
+
+<!-- CSSJSON.border-right.compatibility -->
+
+<!-- CSSJSON.border-right.reference -->
\ No newline at end of file

docs/uni-app-x/css/border-top.md

+## border-top
+
+
+<!-- CSSJSON.border-top.description -->
+
+<!-- CSSJSON.border-top.syntax -->
+
+<!-- CSSJSON.border-top.values -->
+
+<!-- CSSJSON.border-top.compatibility -->
+
+<!-- CSSJSON.border-top.reference -->
\ No newline at end of file