Add STM6822x schematic

schematics/shimatta_supervisor.dcm

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+EESchema-DOCLIB  Version 2.0
+#
+$CMP STM6822x
+D 5-pin supervisor with watchdog timer and push-button reset
+K supervisor, watchdog, reset
+F https://www.st.com/content/ccc/resource/technical/document/datasheet/group0/7f/60/27/e3/bf/f2/4e/2c/CD00047783/files/CD00047783.pdf/jcr:content/translations/en.CD00047783.pdf
+$ENDCMP
+#
+#End Doc Library

schematics/shimatta_supervisor.lib

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+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# STM6822x
+#
+DEF STM6822x U 0 40 Y Y 1 F N
+F0 "U" 250 150 50 H V C CNN
+F1 "STM6822x" 250 50 50 H V C CNN
+F2 "Package_TO_SOT_SMD:SOT-23-5" 250 250 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+S 0 0 500 -450 0 1 0 f
+X ~RST 1 700 -100 200 L 50 50 1 1 C V
+X VSS 2 700 -350 200 L 50 50 1 1 W
+X ~MR 3 -200 -250 200 R 50 50 1 1 I L
+X WDI 4 -200 -350 200 R 50 50 1 1 I C
+X VCC 5 -200 -100 200 R 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library