docs: Add a Testmonials page.

Show our positive reviews to the world. It's also not completly serious, in a similar fashion to
Phabricator.

Co-Authored-By: Austin Seipp <aseipp@pobox.com>

docs/testimonials.md

@@ -0,0 +1,124 @@
+# Testimonials
+
+You might not be ready to make the jump to Jujutsu yet. It's understandable; new
+tools come with new lessons, failures, and ideas to absorb. They require
+practice. In order to provide some motivation, we've collected a number of real,
+100% authentic testimonials — from our loving users, our silly developers
+— all to tip the scales and get you on our side!
+
+## What the users have to say 
+
+> I've spent many years of my career working on version control. What I like
+> most about Jujutsu is how it has non-obvious solutions to UX problems that
+> we've run into in the past. What most people may not realize is that there are
+> many novel features which all interlock to make it easy to use.
+>
+> For example, consider Jujutsu's support for automatically rebasing descendants
+> of amended revisions. When we implemented that in Mercurial, we ran into an
+> issue: what if there's a merge conflict? Our solution was to warn users and
+> just not perform the auto-rebase. Now, suddenly, users have to understand that
+> there can be old versions of the same revision visible in their log, and learn
+> how to fix this state.
+>
+> In contrast, Jujutsu's solution is to simply make merge conflicts first-class.
+> This is not just an improvement in general, it is also specifically an
+> improvement for auto-rebase — users no longer have to learn about old
+> versions of a revision unless they want to look at the obslog.
+>
+> Over and over, I'm struck by how well Jujutsu demonstrates this kind of
+> evolved thinking, which as an experienced version control developer I deeply
+> appreciate.
+
+— Rain, engineer at Oxide Computer Company, former VCS developer
+
+> Jujutsu is amazing... I couldn't have come up with anything remotely as
+> elegant.
+>
+> It's so rare that a solution attacks the innermost core of a problem so
+> thoroughly, I genuinely feel blessed to be in its presence. And also a bit
+> vindicated in not even trying to learn to use any of the tools that felt like
+> more crutches stacked upon a sand castle  
+
+— Anonymous user, speaking from the shadows
+
+> It's the easiest time I've ever had learning a tool this deeply this quickly, 
+> because of the ability to experiment and undo, instead of triple-checking 
+> before trying a new scary command.
+
+— Scott Olson, advanced Git user and now a Jujutsu user
+
+> I initially started to use Jujutsu for personal repos, and it has quickly 
+> gone from "neat, let's try this more" to "very neat, added to my permanent 
+> config and automatically installed for new machines".
+
+— Poliorcetics, on GitHub
+
+> when i worked on the rust compiler, my job was to chain together a bunch of
+> strange and cursed tools that broke often. jujutsu breaks about half as
+> much, so that's pretty good i guess
+
+— jyn514, Rust contributor
+
+> Jujutsu is pretty cool, you can even keep most of your existing workflows 
+
+— Ben, who doesn't want you keeping your existing workflow
+
+> Wait, it's not called Jujitsu?
+
+— Phil, Mercurial contributor (who doesn't have to learn Git, now that
+Jujutsu exists)
+
+> When I heard about Jujutsu I decided to try it out before forming an opinion.
+> Technically it never formed, because I haven't considered going back. 
+
+— gul banana, computer programmer 
+
+## What the developers have to say
+
+> I've been a FOSS contributor using Git for over 16 years, and Jujutsu
+> continues to amaze me every day. It has that sweet simplicity I was fond of in
+> Darcs, but it boils down all my most core and fundamental workflows —
+> developed over years of experience — into a simple set of primitives.
+> The internal design is simple and beautiful; it looks like a database, making
+> the implementation elegant, safe, and extensible. All this, using the same Git
+> repositories my coworkers use.
+>
+> It's like if you found out one day that you built your entire home on a vein
+> of rich gold. Every day I seem to find new and beautiful emergent behaviors,
+> all adding up to a tool that is greater than the sum of its parts.
+
+— Austin Seipp, "No 1. Jujutsu Fan"
+
+> Honestly, I implemented signing support mostly for that sweet dopamine hit
+> that you get from the green checkmark on GitHub. Yeah.
+
+— Anton Bulakh, contributor and dopamine enthusiast
+
+> I'm sometimes still surprised that navigating with `jj next` and `jj prev` 
+> works.
+
+— Philip Metzger, author of `jj next` and `jj prev`
+
+> I'm surprised when it works.
+
+— Martin von Zweigbergk, project creator and leader
+
+## Spread the word yourself
+
+Are you satisfied with Jujutsu? Ready to recommend it to a Jujillion of your
+friends and coworkers? Great! The easiest way to help the project grow is word
+of mouth. So make sure to talk to them about it and show off your hip new tool.
+Maybe post a link to it on your other favorite tool that you love using, Slack?
+
+If you're not sure what to say, we hired the cheapest marketing team we could
+find to design a list of Pre-Approved Endorsements in their laboratory. Just
+copy and paste these right into a text box! Shilling for an open source project
+has never been easier than this.
+
+> Jujutsu is an alright tool. I guess.
+
+> Jujutsu is my favorite software tool of all time. I am saying this for no
+> particular reason, definitely not because I was paid to.
+
+> I love Jujutsu. I love Jujutsu. I love Jujutsu. I love Jujutsu. I love
+> Jujutsu. I love Jujutsu. I love Jujutsu. I love Jujutsu.

mkdocs.yml

@@ -88,6 +88,8 @@ nav:
 
 - "CLI Reference": 'cli-reference.md'
 
+- Testimonials: 'testimonials.md'
+
 - Concepts:
       - 'Working Copy': 'working-copy.md'
       - 'Branches': 'branches.md'