[gnome-build-meta.wiki] Create Preliminary build instructions

[Tanvir Roshid <tanvirroshid src gnome org>]

commit c4a56ccf4b3bddd387125d04d9fda71d13363da3
Author: Tanvir Roshid <tanvirroshid786123 gmail com>
Date:   Fri Sep 16 12:07:48 2022 +0000

    Create Preliminary build instructions

 Preliminary-build-instructions.md | 5 +++++
 1 file changed, 5 insertions(+)
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diff --git a/Preliminary-build-instructions.md b/Preliminary-build-instructions.md
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index 0000000..218fc42
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+++ b/Preliminary-build-instructions.md
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+On a AARCH64 machine such as a Nvidia Jetson:
+```
+bst build boards/pinephone/image.bst
+bst checkout boards/pinephone/image.bst checkout
+```
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