Several improvements (#117)

INSTRUCTIONS.txt

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+Thank you for downloading oobabooga/text-generation-webui!
+
+# Installation
+
+Run the "start" script. It will install the web UI and all of its
+dependencies inside this folder.
+
+To launch the web UI in the future after it is already installed, run the
+"start" script again.
+
+# Updating the web UI
+
+Run the "update" script. It will install the updates only, so it should
+be much faster than the initial installation.
+
+# Adding flags like --chat, --notebook, etc
+
+Open the "CMD_FLAGS.txt" file with a text editor, add your flags, and
+save the file. For instance, to add the --api flag, change the file
+contents to
+
+--chat --api
+
+# Running an interactive shell
+
+Sometimes you may need to install some additional Python package. To do
+that, run the "cmd" script and type your commands inside the terminal
+window that will appear.
+
+# Using an AMD GPU in Linux
+
+Requires ROCm SDK 5.4.2 or 5.4.3 to be installed. Some systems may also
+need: sudo apt-get install libstdc++-12-dev
+
+Edit the "webui.py" script using a text editor and un-comment and
+modify the lines near the top of the script according to your setup. In
+particular, modify the os.environ["ROCM_PATH"] = '/opt/rocm' line to
+point to your ROCm installation.