🧞: Update installation and usage instructions for pre-commit and git-…

…genie hooks. Add guidelines for generating and explaining complex git commands.

README.md

@@ -12,10 +12,11 @@ Generated command: git commit -m 'Update README with commit message example and
 
 ### Generate commit messages as a pre-commit hook
 
-#### Install pre-commit
+#### Install pre-commit & git-genie hooks
 
 ```shell
 pip install pre-commit
+pre-commit install --hook-type commit-msg
 ```
 
 #### Add pre-commit hook
@@ -32,15 +33,28 @@ repos:
 #### Watch the magic happen
 
 ```shell
-~/Personal/git-genie-pre-commit main* ❯ git add . && git commit -m "test"
+~/Personal/git-genie-pre-commit main* ❯ git add . && git commit -m "git-genie please help me write a commit message"
 
 git-genie................................................................Passed
 
-[main 0dc8c69] test 🧞: Specify specific revision and add '--mode=replace' argument to git-genie hook.
+[main 0dc8c69] git-genie please help me write a commit message 🧞: Update .pre-commit-config.yaml for git-genie v0.1.1 Add --fix and --exit-non-zero-on-fix for ruff hooks.
 
  1 file changed, 2 insertions(+), 1 deletion(-)
 ```
 
+In the above example, the commit message includes the original message and the message generated by git-genie.
+If you with to replace the original message, use `--mode=replace` instead of `--mode=append`.
+
+The results will be similar to the following:
+
+```shell
+~/Personal/git-genie-pre-commit main* ⇡ ❯ git commit -m "asdsakdfnlsknflag"                                                                                                                 3.10.7 repobuddy 14:26:04
+
+git-genie................................................................Passed
+[main 9bf1d83] 🧞: Update pre-commit hook to use "--mode=replace" and change port mapping to "5435:5435".
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+```
+
 ### Generate & Explain complex git commands using plain english
 
 ![example](example.png)

git_genie/main.py

@@ -189,7 +189,9 @@ def generate_commit_message(diff: str) -> str:
     giving a command. The first line should be no longer than 50 characters and should start with a capital letter. The
     following lines should be no longer than 72 characters.
 
-    Only focus on the changed lines. Do not include lines that were not changed.
+    In the Changes below, the lines that start with a + are lines that were added. The lines that start with a - are
+    lines that were removed. Other lines are unchanged. Only focus on the changed lines. Do not include lines that
+    were not changed.
 
     Be direct, try to eliminate filler words and phrases in these sentences (examples: though, maybe, I think, kind of).
     Think like a journalist. Be concise. Be clear. Be consistent. Be professional. Be respectful.