Add initial documentation

#95

docs/README.md

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+Elegant git
+===========
+Your `git` experience will be changed forever.
+
+Philosophy
+----------
+- declarative interaction
+- no merge commits
+
+Limitations
+-----------
+Support only one default remote - `origin`.
+
+Commands
+--------
+### feature
+Creates a new branch based on `master`. If there are some uncommitted changes, they will be moved to the new branch.
+
+### pull
+Downloads new updates for a local branch.
+
+### push
+Upload current local branch to a remote one. If the remote branch is absent, it will be created.
+
+### rebase
+Reapplies commits on top of the latest `origin/master`.
+
+### push-after-rebase
+Executes [git elegant push](#push) after [git elegant rebase](#rebase).
+
+### init
+Creates an empty Git repository or reinitialize an existing one. Then runs local repository configuration.
+
+### clone
+Clone a repository into a new directory. Then runs local repository configuration.
+
+### add
+Adds file contents to the index interactively.
+
+### clear-local
+Removes all local branches which don't have remote tracking branches.
+
+### configure
+Defines some settings for both _global_ and _local_ `git config`.
+
+### check
+Shows trailing whitespaces of uncommitted changes.
+
+### commands
+Displays all available commands.
+