[DOCs] Missing files for last commit

docs/1_SCH_2_diff_PCBs/PCB_1/.gitignore

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-Generated
 fp-info-cache
 *.kicad_prl
+*-backups

docs/1_SCH_2_diff_PCBs/PCB_2/.gitignore

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-Generated
 fp-info-cache
 *.kicad_prl
+*-backups

docs/1_SCH_2_diff_PCBs/README.md

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+# One schematic and two different PCBs
+
+This example shows one way to handle a situation where we have one schematic
+and we want to create two different PCBs from the same circuit.
+
+The proposed solution is to use one schematic and two KiCad projects.
+Each project includes the same schematic using a hierarchical sheet.
+
+In this way we get two different PCBs, one for each project, but both with
+the same circuit.
+
+## PCB 1
+
+[Schematic](PCB_1/Generated/Schematic.pdf)
+
+[PCB](PCB_1/Generated/PCB_1-assembly.pdf)
+
+![Top view](PCB_1/Generated/PCB_1-3D_top.png)
+
+![Bottom view](PCB_1/Generated/PCB_1-3D_bottom.png)
+
+## PCB 2
+
+[Schematic](PCB_2/Generated/Schematic.pdf)
+
+[PCB](PCB_1/Generated/PCB_2-assembly.pdf)
+
+![Top view](PCB_1/Generated/PCB_2-3D_top.png)
+
+![Bottom view](PCB_1/Generated/PCB_2-3D_bottom.png)