feat: initial echo implemented

proj/AudioProc.cache/wt/webtalk_pa.xml

proj/AudioProc.runs/impl_1/audioProc.vdi

proj/AudioProc.runs/impl_1/gen_run.xml

proj/AudioProc.runs/impl_1/usage_statistics_webtalk.xml

proj/AudioProc.runs/impl_1/vivado.pb

proj/AudioProc.runs/impl_1/write_bitstream.pb

proj/AudioProc.runs/synth_1/gen_run.xml

proj/AudioProc.sim/sim_1/behav/xsim/webtalk.jou

proj/AudioProc.sim/sim_1/behav/xsim/webtalk_20672.backup.jou

proj/AudioProc.sim/sim_1/behav/xsim/webtalk_51856.backup.jou

...ir/tb_firUnit_behav/webtalk/usage_statistics_ext_xsim.xml

...v/xsim/xsim.dir/tb_firUnit_behav/webtalk/xsim_webtalk.tcl

...c.sim/sim_1/behav/xsim/xsim.dir/tb_firUnit_behav/xsim.mem

proj/AudioProc.sim/sim_1/behav/xsim/xvhdl.pb

proj/AudioProc.xpr

vivado.jou

vivado_120867.backup.jou