Created Simple attach usage (markdown)

Simple-attach-usage.md

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+During the evolution of BOINC there have been
+three ways for users to get started
+(i.e. create a project account, install BOINC,
+and attach to the account):
+
+* Ancient attach: you download the client installer from the BOINC web site.
+You run it, and use the Attach Project dialog to specify a project
+(by typing its URL) and create a project with email/password.
+
+* Old attach: like Ancient, but you choose the project from a menu.
+
+* [Simple Attach](SimpleAttach): you create an account using
+a form on the project website
+and download the installer from the project website.
+When the client runs, it's pre-attached to the account.
+
+Simple Attach has the advantages that:
+* It's simpler (fewer clicks).
+* The UI is in the web, not the Manager.
+Projects can customize the UI.
+
+To use Simple Attach, a project must:
+
+* Upgrade their server software
+    (just the web software, if they want).
+* Make a minor modification to the home page (index.php).
+  Namely: make a Join button that links to signup.php.
+
+## Projects using Simple Attach
+
+* Asteroids@home
+* BOINC Central
+* DENIS@home
+* iThena.net
+* Milkyway@home
+* Rakesearch
+* Ramanujan Machine (1)
+* SiDock@home
+
+(1) Join/signup button is not prominent on home page
+
+## Projects using Old attach
+
+* climateprediction.net (1)
+* Einstein@home (2)
+* GPUGrid.net
+* LHC@home (2)
+* Moo! Wrapper (2)
+* NFS@Home (1)
+* NumberFields@home (2)
+* ODLK (2)
+* ODLK1 (2)
+* Rosetta@home (2)
+* Universe@home (3)
+* World Community Grid (1)
+* YAFU (2)
+
+(2) outdated Android instructions (we don't use Google or Amazon app stores anymore)
+
+(3) has nice pictures showing install/register
+
+## Projects using Ancient attach
+
+* Amicable numbers
+* Gerasim@Home
+* PrimeGrid (1)
+* Radioactive@home (1)
+* RNA World (1)
+* SRBase (1)
+* Yoyo@home (1)
+
+No response:
+
+LODA
+
+## Account managers using Simple Attach
+
+* Science United
+
+## Account managers using Old attach
+
+* BAM!
+* GridRepublic (4,5)
+* Charity Engine (5)
+
+(4) has very old project list
+
+(5) refers to 'BOINC account'.  Ambiguous/confusing.
+
+Not sure:
+
+GRCPool
+
+