meson: Support local build

Add necessary dependencies and subproject files to support local meson
build.

Tested:
"meson setup build && cd build && meson compile" finishes successfully.

Change-Id: I27a495811e9aa71db5292952ed5bc44a691ec1d6
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..34ad500
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+build*/
+subprojects/*
+!subprojects/phosphor-logging.wrap
+!subprojects/boost.wrap
+!subprojects/packagefiles