Add initial tests

test/readme.md

@@ -0,0 +1,32 @@
+# Vader Tests
+
+> Requires Vim 8 or Neovim, due to the way dependencies are installed.
+
+To run the tests, you need to install the dependencies first. Use the
+[installation script](install.sh):
+
+```sh
+test/install.sh
+```
+
+## Running the tests from the command line
+
+You can run the tests with the following command:
+
+```sh
+vim -u test/vimrc -c 'Vader! test/*.vader'
+```
+
+## Running the tests from within Vim
+
+Open vim with:
+
+```
+vim -u test/vimrc
+```
+
+Then, you can run the tests with the following command:
+
+```vim
+:Vader test/*.vader
+```