patch 9.1.1177: filetype: tera files not detected

Problem:  filetype: tera files not detected
Solution: detect '*.tera' files as tera filetype,
          include a simple filetype plugin
          (MuntasirSZN)

closes: #16806

Signed-off-by: MuntasirSZN <muntasir.joypurhat@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index d8fc0a1..b6beb3f 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -804,6 +804,7 @@
     teal: ['file.tl'],
     templ: ['file.templ'],
     template: ['file.tmpl'],
+    tera: ['file.tera'],
     teraterm: ['file.ttl'],
     terminfo: ['file.ti'],
     'terraform-vars': ['file.tfvars'],
diff --git a/src/version.c b/src/version.c
index 65c7169..790fc7d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1177,
+/**/
     1176,
 /**/
     1175,