Add pkgconfig

Generate pkgconfig for phosphor-ipmi-blobs so that the library can be
found by Meson.

When used as a dependency, phosphor-ipmi-blobs provides only a header
file and no libraries to link against, so the pkgconfig file has no
linker flags.

Tested: added phosphor-ipmi-blobs as a dependency in
phosphor-health-monitor's meson.build file and built successfully.

signed-off-by: Sui Chen <suichen@google.com>
Change-Id: I126c66dbd65ddbd99f921297d813e7a0f9981f22
diff --git a/phosphor-ipmi-blobs.pc.in b/phosphor-ipmi-blobs.pc.in
new file mode 100644
index 0000000..1ccc785
--- /dev/null
+++ b/phosphor-ipmi-blobs.pc.in
@@ -0,0 +1,5 @@
+Name: phosphor-ipmi-blobs
+Description: Phosphor Blob Transfer Interface
+URL: https://github.com/openbmc/phosphor-ipmi-blobs
+Version: @VERSION@
+Cflags: -I@includedir@