add lc3 encoder script and text to speech script

encode/encode_lc3.py

@@ -0,0 +1,18 @@
+import subprocess
+
+
+def encode_lc3(file):
+
+    file = file.replace('.wav', '')
+    ret = subprocess.run(['elc3', '-b', '48000', f'{file}.wav', f'{file}.lc3'])
+
+    return ret.returncode, ret.stdout, ret.stderr
+
+if __name__ == '__main__':
+    import os
+    os.chdir(os.path.dirname(__file__))
+    r, stdout, stderr =  encode_lc3('welcome_resampled.wav')
+
+    print(r)
+    print(stdout)
+    print(stderr)