Add LGTM config file

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

lgtm.yml

@@ -0,0 +1,22 @@
+extraction:
+  cpp:
+    prepare:
+      packages:
+      - "libboost-system-dev"
+      - "libboost-thread-dev"
+      - "libevent-dev"
+      - "libhiredis-dev"
+      - "libnl-3-dev"
+      - "libnl-route-3-dev"
+      - "libnl-nf-3-dev"
+      - "libnl-genl-3-dev"
+      - "libgmock-dev"
+      - "dh-exec"
+      - "swig3.0"
+    after_prepare:
+    - "git clone https://github.com/Azure/sonic-swss-common; pushd sonic-swss-common; ./autogen.sh; fakeroot dpkg-buildpackage -us -uc -b; popd"
+    - "dpkg-deb -x libswsscommon_1.0.0_amd64.deb $LGTM_WORKSPACE"
+    - "dpkg-deb -x libswsscommon-dev_1.0.0_amd64.deb $LGTM_WORKSPACE"
+    index:
+      build_command:
+        - "make all LDFLAGS=\"-L${LGTM_WORKSPACE}/usr/lib/x86_64-linux-gnu\" CPPFLAGS=\"-I${LGTM_WORKSPACE}/usr/include -I${LGTM_WORKSPACE}/usr/include/swss\""