chore: add editorconfig for shell scripts

.editorconfig

@@ -0,0 +1,25 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.sh]
+shell_variant = bash
+indent_style = tab
+indent_size = 4
+switch_case_indent = true
+space_redirects    = true
+keep_padding = true
+binary_next_line   = true
+
+[Makefile]
+indent_style = tab
+
+[awsm/**]
+ignore = true
+
+[thirdparty/**]
+ignore = true