Add basic build scripts

scripts/build_longnail.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+pushd deps/longnail
+
+git submodule update --init --recursive --depth 1
+OR_TOOLS_VER="9.11" ./build_deps.sh
+./build_circt.sh
+./build_longnail.sh
+
+popd

scripts/build_scaie-v.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+pushd deps/scaie-v
+
+mvn package
+
+popd

scripts/build_treenail.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+pushd deps/treenail
+
+git submodule update --init
+./gradlew build
+./gradlew install
+
+popd